Constant current driving circuit and lamp
By integrating the regulation module, the first Zener diode, and the buck regulator circuit, and using an NMOS transistor as a switch, the high cost problem caused by the separate setting of the traditional constant current drive circuit and switching power supply is solved, achieving dual optimization of stability and cost.
Patent Information
- Application Number
- CN202520339678.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-28
AI Technical Summary
Traditional constant current drive circuits and switching power supplies are set up separately, resulting in high manufacturing costs and a lack of stability.
By employing an adjustment module, a first Zener diode, and a buck regulator circuit, combined with an NMOS transistor as a switch, constant current and switching functions are integrated into one unit, reducing the dependence on switching power supplies.
It improves the stability of the constant current drive circuit, reduces manufacturing costs, and enhances practicality.
Smart Images
Figure CN223957684U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power supply technical field especially relates to a constant current drive circuit and lamps and lanterns. BACKGROUND
[0002] At present, many current type drive loads, such as LED, in the field of LED lighting constant current drive, constant current drive has the advantages such as simple control, production convenient and is widely used. With the high-speed development of LED lighting technology, the cost, efficiency and stability of LED drive are required more and more.
[0003] The traditional constant current drive circuit is only driving effect, when LED and some current type drive loads are driven by the constant current drive circuit, still need to match the switching power supply to carry out switching control, and the traditional switching power supply and constant current drive circuit are separately arranged, need to purchase respectively when producing and manufacturing, improve the cost of production and manufacturing. UTILITY MODEL CONTENTS
[0004] The utility model discloses a constant current drive circuit and lamps and lanterns, are provided with adjustment module, first stabilivolt and voltage reducing stabilizing circuit, improve the stability of constant current drive circuit, and the constant current drive circuit structure of the application reduces the cost of production and manufacturing.
[0005] To solve the above technical problem, the utility model adopts the following technical scheme:
[0006] One aspect of the utility model discloses a constant current drive circuit and lamps and lanterns, the constant current drive circuit includes: adjustment module, the power input end of adjustment module is connected with first power supply;First stabilivolt, first resistance, second resistance and third resistance, the cathode of first stabilivolt is connected with the output end of adjustment module, and the second power supply is exported after the voltage stabilization of first stabilivolt, and the anode of first stabilivolt is connected with the feedback end of adjustment module, one end of first resistance and one end of second resistance, and one end of third resistance is grounded;The cathode of first stabilivolt is used for connecting the anode of load, and the other end of second resistance and the other end of third resistance are used for connecting the cathode of load, and the adjustment module adjusts the value of second power supply according to the feedback signal of feedback end;Voltage reducing stabilizing circuit, the input end of voltage reducing stabilizing circuit is connected with the cathode of first stabilivolt, and the output end of voltage reducing stabilizing circuit is connected with the other end of first resistance.
[0007] In some embodiments, the voltage reduction and voltage stabilization circuit comprises an NPN triode, a second voltage stabilizing tube and a fourth resistor, the collector of the NPN triode and one end of the fourth resistor are connected to the cathode of the first voltage stabilizing tube, the other end of the fourth resistor is connected to the base of the NPN triode and the cathode of the second voltage stabilizing tube, the anode of the second voltage stabilizing tube is grounded, and the emitter of the NPN triode outputs a third power supply to the first resistor.
[0008] In some embodiments, the voltage reduction and voltage stabilization circuit further comprises a fifth resistor and a sixth resistor, the second voltage stabilizing tube is a TL431, the reference end of the second voltage stabilizing tube is connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor is connected to the emitter of the NPN triode, and the other end of the sixth resistor is grounded.
[0009] In some embodiments, the voltage reduction and voltage stabilization circuit further comprises a first capacitor, the positive electrode of the first capacitor is connected to the emitter of the NPN triode, and the negative electrode of the first capacitor is grounded.
[0010] In some embodiments, the constant current drive circuit further comprises an NMOS tube and a control module, the source of the NMOS tube is connected to the other end of the second resistor and the other end of the third resistor, the drain of the NMOS tube is used to connect the negative electrode of the load, the gate of the NMOS tube is connected to the first control output end of the control module, and the second control output end of the control module is connected to the enable end of the adjustment module.
[0011] In some embodiments, the constant current drive circuit further comprises a filtering circuit, the filtering circuit comprises an inductor, a diode and a second capacitor, one end of the inductor is connected to the output end of the adjustment module and the negative electrode of the diode, the positive electrode of the diode is grounded, the other end of the inductor is connected to the positive electrode of the second capacitor, the cathode of the first voltage stabilizing tube and the input end of the voltage reduction and voltage stabilization circuit, and the negative electrode of the second capacitor is grounded.
[0012] In some embodiments, the constant current drive circuit further comprises an interface, the first electrode of the interface is connected to the cathode of the first voltage stabilizing tube, the second electrode of the interface is connected to the drain of the NMOS tube, and the interface is used to connect the load.
[0013] In one aspect of an embodiment of the utility model, a lamp is provided, and the lamp comprises the constant current drive circuit.
[0014] The utility model discloses a kind of constant current drive circuit and lamps and lanterns according to the utility model embodiment, at least have following beneficial effects: the present application is provided with adjusting module, first stabilivolt and voltage reduction stabilizing circuit, adjusting module is according to the feedback signal of voltage reduction stabilizing circuit, load and first stabilivolt adjusting the current output value of output end, to further adjust the value of second power supply, improve the stability of constant current drive circuit, and the constant current drive circuit of the present application is simple in structure, reduce the cost of production and manufacture.The present application is also provided with NMOS tube between the negative pole of load and third resistance, to act as the function of switch, so that constant current drive circuit can be constant current, can also switch load, need not to buy switch power supply again, improve practicability, reduce the cost of production and manufacture.
[0015] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.
[0017] Figure 1 The constant current drive circuit schematic diagram according to the embodiment. DETAILED DESCRIPTION
[0018] The technical solutions of the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0019] The terms "first", "second", "third" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.
[0020] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "connects", "connects" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connects;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0021] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these example implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects of the example implementations to those skilled in the art. The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure. The drawings are not intended to be restrictive in any way.
[0022] The technical solutions of the embodiments of the present application are briefly described below:
[0023] According to some embodiments, as Figure 1 The present application provides a constant current driving circuit, which comprises:
[0024] An adjusting module, a power input end VIN of the adjusting module is connected with a first power supply V1;
[0025] A first voltage stabilizing tube DZ1, a first resistor R1, a second resistor R2 and a third resistor R3, a cathode of the first voltage stabilizing tube DZ1 is connected with an output end SW of the adjusting module, the first voltage stabilizing tube DZ1 outputs a second power supply V2 after voltage stabilization, an anode of the first voltage stabilizing tube DZ1 is connected with a feedback end FB of the adjusting module, one end of the first resistor R1 and one end of the second resistor R2, one end of the third resistor R3 is grounded;
[0026] The cathode of the first voltage stabilizing tube DZ1 is used for connecting the positive pole of a load, the other end of the second resistor R2 and the other end of the third resistor R3 are used for connecting the negative pole of the load, and the adjusting module adjusts the value of the second power supply V2 according to the feedback signal of the feedback end FB;
[0027] A step-down voltage stabilizing circuit, an input end of the step-down voltage stabilizing circuit is connected with the cathode of the first voltage stabilizing tube DZ1, and an output end of the step-down voltage stabilizing circuit is connected with the other end of the first resistor R1.
[0028] The working principle of the above embodiment is that after the power input end VIN of the adjusting module receives the first power V1, the output end SW of the adjusting module outputs the second power V2, the first voltage stabilizing tube DZ1 outputs the second power V2 to the positive electrode of the load and the input end of the voltage reduction and voltage stabilization circuit after voltage stabilization, and the negative electrode of the load is grounded through the third resistor R3. The feedback end FB of the adjusting module receives the feedback signal through the first resistor R1 and the second resistor R2, and when the feedback signal is not within the set range, the adjusting module adjusts the value of the second power V2, so that the electrical signal value of the feedback signal is within the set range.
[0029] The adjusting module, the first voltage stabilizing tube DZ1 and the voltage reduction and voltage stabilization circuit are arranged in the application, the adjusting module adjusts the current output value of the output end according to the feedback signal of the voltage reduction and voltage stabilization circuit, the load and the first voltage stabilizing tube DZ1, so as to further adjust the value of the second power V2, thereby improving the stability of the constant current driving circuit, and the constant current driving circuit of the application has a simple structure and reduces the production and manufacturing cost.
[0030] The application is described below in detail with reference to the accompanying drawings of the specification. Figure 1 The preferred embodiments of the present disclosure are further described in detail.
[0031] According to some embodiments, as shown in Figure 1 The voltage reduction and voltage stabilization circuit includes an NPN triode Q1, a second voltage stabilizing tube DZ2 and a fourth resistor R4, and the specific connection mode is as follows,
[0032] The collector of the NPN triode Q1 and one end of the fourth resistor R4 are connected to the cathode of the first voltage stabilizing tube DZ1, the other end of the fourth resistor R4 is connected to the base of the NPN triode Q1 and the cathode of the second voltage stabilizing tube DZ2, the anode of the second voltage stabilizing tube DZ2 is grounded, and the emitter of the NPN triode Q1 outputs the third power V3 to the first resistor R1.
[0033] Further, as shown in Figure 1 The voltage reduction and voltage stabilization circuit further includes a fifth resistor R5 and a sixth resistor R6, and the specific connection mode is as follows,
[0034] The second voltage stabilizing tube DZ2 adopts TL431, the reference end of the second voltage stabilizing tube DZ2 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the fifth resistor R5 is connected to the emitter of the NPN triode Q1, and the other end of the sixth resistor R6 is grounded.
[0035] Further, as shown in Figure 1 The voltage reduction and voltage stabilization circuit further includes a first capacitor C1, the positive electrode of the first capacitor C1 is connected to the emitter of the NPN triode Q1, and the negative electrode of the first capacitor C1 is grounded.
[0036] The working principle of the above embodiment is that when the voltage of the second power supply V2 increases, the base voltage of the NPN transistor Q1 increases, the output of the NPN transistor Q1 increases, the output of the TL431 also increases, the base voltage of the NPN transistor Q1 decreases, and the output of the NPN transistor Q1 decreases, thereby achieving the effect of voltage stabilization.
[0037] When the voltage of the second power supply V2 decreases, the base voltage of the NPN transistor Q1 decreases, the output of the NPN transistor Q1 decreases, the output of the TL431 also decreases, the base voltage of the NPN transistor Q1 increases, and the output of the NPN transistor Q1 increases, thereby achieving the effect of voltage stabilization.
[0038] The voltage of the third power supply V3 is lower than the voltage of the second power supply V2.
[0039] According to some embodiments, as shown in Figure 1 The constant current driving circuit further includes an NMOS tube Q2 and a control module, the source of the NMOS tube Q2 is connected to the other end of the second resistor R2 and the other end of the third resistor R3, the drain of the NMOS tube Q2 is used to connect the negative electrode of the load, and the gate of the NMOS tube Q2 is connected to the first control output end 100 of the control module. The second control output end of the control module is connected to the enable end EN of the adjustment module.
[0040] The working principle of the above embodiment is that when the load needs to work, the first control output end 100 of the control module outputs a PWM signal to the gate of the NMOS tube Q2, and the second control output end of the control module outputs an enable signal EN to the enable end EN of the adjustment module. When the load does not need to work, the first control output end 100 of the control module stops outputting the PWM signal; when the second power supply V2 is not needed, the second control output end of the control module stops outputting the enable signal EN.
[0041] The present application sets the NMOS tube Q2 between the negative electrode of the load and the third resistor R3 as a switch, so that the constant current driving circuit can not only constant current, but also switch the load, without the need to additionally purchase a switching power supply, thereby improving the practicability and reducing the production cost.
[0042] According to some embodiments, as shown in Figure 1 The constant current driving circuit further includes a filter circuit, and the filter circuit includes an inductor L, a diode D, and a second capacitor C2, and the specific connection mode is as follows,
[0043] One end of the inductor L is connected to the output end SW of the adjustment module and the negative electrode of the diode D, the positive electrode of the diode D is grounded, the other end of the inductor L is connected to the positive electrode of the second capacitor C2, the cathode of the first voltage stabilizing tube DZ1, and the input end of the voltage reduction and voltage stabilization circuit, and the negative electrode of the second capacitor C2 is grounded.
[0044] The application sets a filter circuit between the output terminal SW of the regulating module and the cathode of the first stabilizing tube DZ1 to filter the second power supply V2 outputted by the regulating module.
[0045] According to some embodiments, as shown in Figure 1 The constant current driving circuit further comprises an interface CON, a first electrode of the interface CON is connected to the cathode of the first stabilizing tube DZ1, a second electrode of the interface CON is connected to the drain of the NMOS tube Q2, and the interface CON is used to connect a load to facilitate disconnection.
[0046] According to some embodiments, the application provides a lamp, which comprises the constant current driving circuit as described above.
[0047] In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0048] Although the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terms used are illustrative and not restrictive, and that the use of such terms is not intended to limit the scope of the present disclosure. Since the present disclosure can be embodied in many different forms without departing from the spirit or essential characteristics thereof, it should be understood that the above-described embodiments are not limited to any of the aforementioned details, but are to be construed broadly within the spirit and scope of the appended claims, and all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds, are therefore intended to be embraced by the appended claims.
Claims
1. A constant current driving circuit characterized by comprising: The constant current drive circuit comprises: an adjusting module, a power input end of the adjusting module being connected to a first power supply; a first voltage stabilizing tube, a first resistor, a second resistor and a third resistor, a cathode of the first voltage stabilizing tube being connected to an output end of the adjusting module, the first voltage stabilizing tube outputting a second power supply after voltage stabilization, an anode of the first voltage stabilizing tube being connected to a feedback end of the adjusting module, one end of the first resistor and one end of the second resistor, one end of the third resistor being grounded; the cathode of the first voltage stabilizing tube being used for connecting a positive electrode of a load, the other end of the second resistor and the other end of the third resistor being used for connecting a negative electrode of the load, the adjusting module adjusting a value of the second power supply according to a feedback signal of the feedback end; a step-down voltage stabilizing circuit, an input end of the step-down voltage stabilizing circuit being connected to the cathode of the first voltage stabilizing tube, an output end of the step-down voltage stabilizing circuit being connected to the other end of the first resistor.
2. The constant current driving circuit according to claim 1, wherein The step-down voltage stabilizing circuit comprises an NPN triode, a second voltage stabilizing tube and a fourth resistor, a collector of the NPN triode and one end of the fourth resistor being connected to the cathode of the first voltage stabilizing tube, the other end of the fourth resistor being connected to a base of the NPN triode and a cathode of the second voltage stabilizing tube, an anode of the second voltage stabilizing tube being grounded, an emitter of the NPN triode outputting a third power supply to the first resistor.
3. The constant current driving circuit according to claim 2, wherein The step-down voltage stabilizing circuit further comprises a fifth resistor and a sixth resistor, the second voltage stabilizing tube being a TL431, a reference end of the second voltage stabilizing tube being connected to one end of the fifth resistor and one end of the sixth resistor, the other end of the fifth resistor being connected to the emitter of the NPN triode, the other end of the sixth resistor being grounded.
4. The constant current drive circuit according to claim 2 or 3, characterized in that, The step-down voltage stabilizing circuit further comprises a first capacitor, a positive electrode of the first capacitor being connected to the emitter of the NPN triode, a negative electrode of the first capacitor being grounded.
5. The constant current driving circuit according to claim 1, wherein The constant current drive circuit further comprises an NMOS tube and a control module, a source of the NMOS tube being connected to the other end of the second resistor and the other end of the third resistor, a drain of the NMOS tube being used for connecting the negative electrode of the load, a gate of the NMOS tube being connected to a first control output end of the control module, a second control output end of the control module being connected to an enable end of the adjusting module.
6. The constant current driving circuit according to claim 1, wherein The constant current drive circuit further comprises a filter circuit, the filter circuit comprising an inductor, a diode and a second capacitor, one end of the inductor being connected to the output end of the adjusting module and a negative electrode of the diode, a positive electrode of the diode being grounded, the other end of the inductor being connected to a positive electrode of the second capacitor, the cathode of the first voltage stabilizing tube and an input end of the step-down voltage stabilizing circuit, a negative electrode of the second capacitor being grounded.
7. The constant current driving circuit according to claim 5, wherein The constant current drive circuit further comprises an interface, a first electrode of the interface being connected to the cathode of the first voltage stabilizing tube, a second electrode of the interface being connected to the drain of the NMOS tube, the interface being used for connecting the load.
8. A luminaire characterized by, The lamp comprises the constant current drive circuit according to any one of claims 1 to 7.