CN218733906U - Constant current source - Google Patents
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- CN218733906U CN218733906U CN202222479479.4U CN202222479479U CN218733906U CN 218733906 U CN218733906 U CN 218733906U CN 202222479479 U CN202222479479 U CN 202222479479U CN 218733906 U CN218733906 U CN 218733906U
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Abstract
The utility model relates to a constant current source, include: the device comprises a power supply module, a reference voltage generation module and a constant current generation module; the power supply module is used for providing power supply voltage; the reference voltage generating module is connected with the power supply module and used for generating reference voltage according to the power supply voltage; the constant current generation module is respectively connected with the reference voltage generation module and the load and used for providing constant current for the load according to the reference voltage. The utility model discloses an adopt discrete components and parts can constitute the constant current source, and with low costs, and circuit area occupied is little, produces the module through reference voltage and provides reference voltage moreover, does not receive the influence of external temperature and load, effectively promotes constant precision, also is favorable to the miniaturization of product simultaneously.
Description
Technical Field
The utility model relates to an electronic circuit technical field, more specifically say, relate to a constant current source.
Background
The constant current source in the market at present is realized by adopting a constant current control chip, and although the mode can realize a constant current with larger power, the constant current control chip has the problems of high cost, large occupied area of a circuit, low constant current precision and the like, and the constant current sources can not be applied to circuits only needing small current constant current sources and are not beneficial to the miniaturization of products.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that to prior art's defect, a constant current source is provided.
The utility model provides a technical scheme that its technical problem adopted is: constructing a constant current source comprising: the device comprises a power supply module, a reference voltage generation module and a constant current generation module;
the power supply module is used for providing power supply voltage;
the reference voltage generating module is connected with the power supply module and used for generating reference voltage according to the power supply voltage;
the constant current generation module is respectively connected with the reference voltage generation module and the load and used for providing constant current for the load according to the reference voltage.
In the constant current source of the present invention, further comprising: a reverse cut-off module;
the reverse cut-off module is respectively connected with the constant current generation module and the load and is used for preventing reverse current from flowing into the constant current generation module.
In the constant current source of the present invention, the reference voltage generating module is formed by connecting a voltage stabilizer and at least one resistor in series; alternatively, the reference voltage generating module is composed of a plurality of resistors connected in series.
In the constant current source of the present invention, the reference voltage generating module includes: a voltage stabilizer and a third resistor;
the first end of the voltage stabilizer is connected with the power supply module, the second end of the voltage stabilizer is connected with the first end of the third resistor, the connecting end of the second end of the voltage stabilizer and the first end of the third resistor is connected with the constant current generation module, and the second end of the third resistor is grounded.
In the constant current source of the present invention, the reference voltage generating module includes: a fourth resistor and a third resistor;
the first end of the fourth resistor is connected with the power supply module, the second end of the fourth resistor is connected with the first end of the third resistor, the connecting end of the second end of the fourth resistor and the first end of the third resistor is connected with the constant current module, and the second end of the third resistor is grounded.
In the constant current source of the present invention, the constant current generating module includes: an adjustable resistor and a switching tube;
the first end of the adjustable resistor is connected with the power supply module, the second end of the adjustable resistor is connected with the second end of the switch tube, the first end of the switch tube is connected with the reference voltage generation module, and the third end of the switch tube is connected with the load.
In the constant current source of the present invention, the switch tube includes a triode or a MOS tube.
In the constant current source of the present invention, the reverse cutoff module comprises: a first diode;
the anode of the first diode is connected with the constant current generation module, and the cathode of the first diode is connected with the load.
In the constant current source of the present invention, further comprising: the device comprises a first filtering module, a second filtering module, a current limiting module and a clamping module;
the first filtering module is connected with the load in parallel;
the input end of the current limiting module is connected with an external dimming input signal, the output end of the current limiting module is connected with the constant current generating module, the first end of the clamping module is connected with the current limiting module, the second end of the clamping module is grounded, and the second filtering module is connected with the clamping module in parallel.
In the constant current source of the present invention, the first filtering module and the second filtering module are both composed of capacitors;
the current limiting module includes at least one resistor, and the clamping module includes: and the cathode of the voltage-stabilizing tube is the first end of the clamping module, and the anode of the voltage-stabilizing tube is the second end of the clamping module.
Implement the utility model discloses a constant current source has following beneficial effect: the method comprises the following steps: the device comprises a power supply module, a reference voltage generation module and a constant current generation module; the power supply module is used for providing power supply voltage; the reference voltage generating module is connected with the power supply module and used for generating reference voltage according to the power supply voltage; the constant current generation module is respectively connected with the reference voltage generation module and the load and used for providing constant current for the load according to the reference voltage. The utility model discloses an adopt discrete components and parts can constitute the constant current source, and with low costs, and circuit area occupied is little, produces the module through reference voltage and provides reference voltage moreover, does not receive the influence of external temperature and load, effectively promotes constant precision, also is favorable to the miniaturization of product simultaneously.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a first constant current source provided by the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the constant current source provided by the present invention;
fig. 3 is a circuit diagram of a first embodiment of a constant current source provided by the present invention;
fig. 4 is a circuit diagram of a second embodiment of the constant current source provided by the present invention;
fig. 5 is a circuit diagram of a third embodiment of the constant current source provided by the present invention;
fig. 6 is a circuit diagram of a fourth embodiment of the constant current source provided by the present invention;
fig. 7 is a circuit diagram of a fifth embodiment of the constant current source provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to solve the problem that the constant current source is realized to the current constant current control chip that adopts with high costs, circuit area occupation is big, the constant current precision is low, the utility model provides a novel constant current source, this constant current source only need adopt very little components and parts can realize the very high constant current source of precision, can the cost of greatly reduced constant current source, and circuit area occupation is little moreover, is favorable to the miniaturization of product very much.
Specifically, refer to fig. 1, which is a schematic structural diagram of a first embodiment of the constant current source provided by the present invention. As shown in fig. 1, the constant current source includes: the device comprises a power supply module 10, a reference voltage generating module 20 and a constant current generating module 30.
The power supply module 10 is used to provide a supply voltage.
The reference voltage generating module 20 is connected to the power supply module 10, and is configured to generate a reference voltage according to the power supply voltage.
Optionally, in some embodiments, the reference voltage generating module 20 is composed of a voltage regulator and at least one resistor connected in series. Alternatively, in some other embodiments, the reference voltage generating module 20 may be composed of a plurality of resistors connected in series.
The constant current generating module 30 is respectively connected to the reference voltage generating module 20 and the load 40, and is configured to provide a constant current to the load 40 according to the reference voltage.
Optionally, in some embodiments, the constant current generation module 30 includes: adjustable resistance and switch tube. The first end of the adjustable resistor is connected with the power supply module 10, the second end of the adjustable resistor is connected with the second end of the switching tube, the first end of the switching tube is connected with the reference voltage generating module 20, and the third end of the switching tube is connected with the load 40.
Optionally, in the embodiment of the present invention, the switch tube may be a triode or a MOS tube. When the switching tube is a triode, the first end of the switching tube is a base electrode of the triode, the second end of the switching tube is an emitting electrode of the triode, and the third end of the switching tube is a collector electrode of the triode; when the switch tube is an MOS tube, the first end of the switch tube is a grid electrode of the MOS tube, the second end of the switch tube is a source electrode of the MOS tube, and the third end of the switch tube is a drain electrode of the MOS tube.
Referring to fig. 2, it is a schematic structural diagram of a second embodiment of the constant current source provided by the present invention. The embodiment further includes, on the basis of the first embodiment: and a reverse blocking module 50.
The reverse blocking module 50 is respectively connected to the constant current generating module 30 and the load 40, and is configured to prevent a reverse current from flowing into the constant current generating module 30. Optionally, in some embodiments, the reverse blocking module 50 may be implemented by a diode, wherein an anode of the diode is connected to the constant current generating module 30, and a cathode of the diode is connected to the load 40, and by providing the reverse blocking module 50, it is possible to prevent current from flowing back into the constant current source to cause abnormal or damaged circuit operation.
Further, as shown in fig. 2, in this embodiment, the constant current source further includes: a first filtering module 60, a second filtering module 80, a current limiting module 70, and a clamping module 90.
Wherein, the first filtering module 60 is connected in parallel with the load 40; the input end of the current limiting module 70 is connected to an external dimming input signal, the output end of the current limiting module 70 is connected to the constant current generating module 30, the first end of the clamping module 90 is connected to the current limiting module 70, the second end of the clamping module 90 is grounded, and the second filtering module 80 is connected to the clamping module 90 in parallel.
Optionally, in some embodiments, the first filtering module 60 and the second filtering module 80 are both composed of capacitors.
In some implementations, current limiting module 70 includes at least one resistor. When implemented using multiple resistors, the multiple resistors may be connected in series, parallel, or series/parallel to form current limiting module 70.
In some implementations, clamp block 90 may be implemented using a voltage regulator. Wherein the cathode of the stabilivolt is the first end of the clamping module 90, and the anode of the stabilivolt is the second end of the clamping module 90.
The following examples are given by way of illustration.
Referring to fig. 3, a circuit diagram of a first embodiment of a constant current source is provided in the present invention.
As shown in fig. 3, in this embodiment, the reference voltage generating module 20 includes: regulator U1 and third resistor R3. The constant current generation module 30 includes: a first triode Q1 and an adjustable resistor RS1. The reverse blocking module 50 includes: a first diode D1. The load 40 includes: a resistance RL.
Specifically, as shown in fig. 3, a first end of the voltage stabilizer U1 is connected to the power supply module 10 (i.e., VCC +), a second end of the voltage stabilizer U1 is connected to a first end of the third resistor R3, a connection end between the second end of the voltage stabilizer U1 and the first end of the third resistor R3 is connected to the constant current generation module 30 (i.e., the first end of the first triode Q1 is connected), and a second end of the third resistor R3 is grounded. The first end of the adjustable resistor RS1 is connected with the first end of the voltage stabilizer U1, and the second end of the adjustable resistor RS1 is connected with the second end of the first triode Q1. The anode of the first diode D1 is connected to the constant current generating module 30 (i.e., connected to the third terminal of the first transistor Q1), the cathode of the first diode D1 is connected to the load 40 (i.e., connected to the first terminal of the resistor RL), and the second terminal of the resistor RL is grounded.
As shown in fig. 3, the voltage of VCC + flows through the third resistor R3 to the ground via the voltage regulator U1, and a stable reference voltage (Va) is generated at the base of the first triode Q1, and since the amplification factor of the first triode Q1 is large, the current flowing to the emitter through the base of the first triode Q1 can be ignored. If the base emitter junction voltage drop of the first triode Q1 is vf, the voltage across the adjustable resistor RS1 is: va-vf, the currents generated are: va-vf/R RS1 (R RS1 The resistance of the adjustable resistor RS 1). Therefore, the resistance value of the adjustable resistor RS1 can be adjusted according to the requirement of the constant current value, and the corresponding constant current can be obtained.
Referring to fig. 4, it is a circuit diagram of a second embodiment of the constant current source provided by the present invention.
As shown in fig. 4, in this embodiment, the reference voltage generating module 20 includes: regulator U1 and third resistor R3. The constant current generation module 30 includes: adjustable resistance RS1 and first triode Q1. The reverse blocking module 50 includes: a first diode D1. The load 40 includes: a first resistor R1 and a second resistor R2. The first filtering module 60 includes: a first capacitor C1. The second filtering module 80 includes: a second capacitor C2. The current limiting module 70 includes: and a fifth resistor R5. The clamping module 90 includes: a voltage regulator tube ZD1.
As shown in fig. 4, the first end of the voltage stabilizer U1 is connected to the power supply module 10 (i.e., VCC +), the second end of the voltage stabilizer U1 is connected to the first end of the third resistor R3, the connection end of the second end of the voltage stabilizer U1 and the first end of the third resistor R3 is connected to the first end of the first transistor Q1, and the second end of the third resistor R3 is grounded. The first end of the adjustable resistor RS1 is connected with the first end of the voltage stabilizer U1, and the second end of the adjustable resistor RS1 is connected with the second end of the first triode Q1. The anode of the first diode D1 is connected with the third end of the first triode Q1, and the cathode of the first diode D1 is grounded through the first resistor R1 and the second resistor R2 in sequence.
The second capacitor C2 is connected in parallel with the second resistor R2, a first end of the fifth resistor R5 is connected to the dimming input signal, and a second end of the fifth resistor R5 is connected to the cathode of the first diode D1. The cathode of the voltage-regulator tube ZD1 is connected with the second end of the fifth resistor R5, the anode of the voltage-regulator tube ZD1 is grounded, the first end of the first capacitor C1 is connected with the first end of the fifth resistor R5, and the second end of the first capacitor C1 is grounded.
As shown in fig. 4, in this embodiment, the fifth resistor R5 is used for limiting current to prevent an excessive current from flowing into the constant current source, the second capacitor C2 and the first capacitor C1 both play a role of filtering, and the zener diode ZD1 is mainly used for clamping an input voltage signal to prevent an excessive voltage from entering the first resistor R1 and the second resistor R2 to damage the load 40.
Referring to fig. 5, a circuit diagram of a third embodiment of the constant current source provided by the present invention is shown.
As shown in fig. 5, the difference between this embodiment and the second embodiment is that this embodiment does not need to provide a reverse blocking module 50, and the rest is the same as the second embodiment.
Referring to fig. 6, a circuit diagram of a fourth embodiment of the constant current source provided by the present invention is shown.
As shown in fig. 6, in this embodiment, the reference voltage generating module 20 includes: a fourth resistor R4 and a third resistor R3. The constant current generation module 30 includes: adjustable resistance RS1 and first triode Q1. The load 40 includes: a first resistor R1 and a second resistor R2. The first filtering module 60 includes: a first capacitor C1. The second filtering module 80 includes: a second capacitor C2. The current limiting module 70 includes: and a fifth resistor R5. The clamping module 90 includes: a voltage regulator tube ZD1.
As shown in fig. 6, a first end of the fourth resistor R4 is connected to the power supply module 10 (i.e., VCC +), a second end of the fourth resistor R4 is connected to a first end of the third resistor R3, a connection end between a second end of the regulator U1 and the first end of the third resistor R3 is connected to the first end of the first transistor Q1, and a second end of the third resistor R3 is grounded. The first end of the adjustable resistor RS1 is connected with the first end of the fourth resistor R4, and the second end of the adjustable resistor RS1 is connected with the second end of the first triode Q1. The third end of the first triode Q1 is grounded through the first resistor R1 and the second resistor R2 in sequence.
The second capacitor C2 is connected in parallel with the second resistor R2, the first end of the fifth resistor R5 is connected to the dimming input signal, and the second end of the fifth resistor R5 is connected to the third end of the first triode Q1. The cathode of the voltage-regulator tube ZD1 is connected with the first end of the fifth resistor R5, the anode of the voltage-regulator tube ZD1 is grounded, the first end of the first capacitor C1 is connected with the first end of the fifth resistor R5, and the second end of the first capacitor C1 is grounded.
Referring to fig. 7, a circuit diagram of a fifth embodiment of the constant current source provided by the present invention is shown.
As shown in fig. 7, the difference between this embodiment and the fourth embodiment is that a reverse blocking module 50 is provided, and the rest is the same as the second embodiment. Wherein, the reaction is by the module and is included: a first diode D1. The anode of the first diode D1 is connected with the third end of the first triode Q1, and the cathode of the first diode D1 is grounded through the first resistor R1 and the second resistor R2 in sequence.
As shown in fig. 3 to 7, the transistor shares the ground with the load, and a fixed reference voltage is generated at the sampling resistor of the emitter by using a voltage follower connection method of the transistor, thereby implementing a constant current. The circuit utilizes the voltage drop nonlinear characteristic of the triode, applies voltage on a structural adjustable resistor through a voltage follower, and thereby generates constant current. Because the stabiliser can provide a very accurate reference voltage, so ultimate pressure drop value can be very accurate, can not receive the influence of external temperature and load, consequently, the utility model discloses a constant current source precision is higher, and the electric current can not produce great fluctuation owing to the change of load and temperature. Meanwhile, due to the existence of the reverse cut-off diode, when the circuit is applied to the occasions of centralized dimming of a plurality of power supplies, the abnormal work of the power supplies caused by the fact that the current of an external dimmer flows back into the constant current source is avoided, and the condition that the normal work of other power supplies or poor dimming is influenced due to the damage of one power supply is avoided.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
Claims (10)
1. A constant current source, comprising: the device comprises a power supply module, a reference voltage generation module and a constant current generation module;
the power supply module is used for providing power supply voltage;
the reference voltage generating module is connected with the power supply module and used for generating reference voltage according to the power supply voltage;
the constant current generation module is respectively connected with the reference voltage generation module and the load and used for providing constant current for the load according to the reference voltage.
2. The constant current source of claim 1, further comprising: a reverse cut-off module;
the reverse cut-off module is respectively connected with the constant current generation module and the load and is used for preventing reverse current from flowing into the constant current generation module.
3. The constant current source of claim 1, wherein the reference voltage generating module is comprised of a voltage regulator in series with at least one resistor; alternatively, the reference voltage generating module is composed of a plurality of resistors connected in series.
4. The constant current source according to claim 3, wherein the reference voltage generating module comprises: a voltage stabilizer and a third resistor;
the first end of the voltage stabilizer is connected with the power supply module, the second end of the voltage stabilizer is connected with the first end of the third resistor, the connecting end of the second end of the voltage stabilizer and the first end of the third resistor is connected with the constant current generation module, and the second end of the third resistor is grounded.
5. The constant current source according to claim 3, wherein the reference voltage generating module comprises: a fourth resistor and a third resistor;
the first end of the fourth resistor is connected with the power supply module, the second end of the fourth resistor is connected with the first end of the third resistor, the connecting end of the second end of the fourth resistor and the first end of the third resistor is connected with the constant current module, and the second end of the third resistor is grounded.
6. The constant current source according to claim 1, wherein the constant current generation module comprises: an adjustable resistor and a switching tube;
the first end of the adjustable resistor is connected with the power supply module, the second end of the adjustable resistor is connected with the second end of the switch tube, the first end of the switch tube is connected with the reference voltage generation module, and the third end of the switch tube is connected with the load.
7. The constant current source of claim 6, wherein the switching tube comprises a triode or a MOS tube.
8. The constant current source of claim 2, wherein the reverse cutoff module comprises: a first diode;
the anode of the first diode is connected with the constant current generation module, and the cathode of the first diode is connected with the load.
9. The constant current source of claim 1, further comprising: the device comprises a first filtering module, a second filtering module, a current limiting module and a clamping module;
the first filtering module is connected with the load in parallel;
the input end of the current limiting module is connected with an external dimming input signal, the output end of the current limiting module is connected with the constant current generating module, the first end of the clamping module is connected with the current limiting module, the second end of the clamping module is grounded, and the second filtering module is connected with the clamping module in parallel.
10. The constant current source of claim 9, wherein the first and second filter modules are each comprised of a capacitor;
the current limiting module includes at least one resistor, and the clamping module includes: and the cathode of the voltage stabilizing tube is the first end of the clamping module, and the anode of the voltage stabilizing tube is the second end of the clamping module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222479479.4U CN218733906U (en) | 2022-09-19 | 2022-09-19 | Constant current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222479479.4U CN218733906U (en) | 2022-09-19 | 2022-09-19 | Constant current source |
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| Publication Number | Publication Date |
|---|---|
| CN218733906U true CN218733906U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222479479.4U Active CN218733906U (en) | 2022-09-19 | 2022-09-19 | Constant current source |
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| CN (1) | CN218733906U (en) |
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- 2022-09-19 CN CN202222479479.4U patent/CN218733906U/en active Active
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