CN218006569U - Constant current drive circuit, constant current power supply and constant current LED lamp - Google Patents
Constant current drive circuit, constant current power supply and constant current LED lamp Download PDFInfo
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- CN218006569U CN218006569U CN202220970829.4U CN202220970829U CN218006569U CN 218006569 U CN218006569 U CN 218006569U CN 202220970829 U CN202220970829 U CN 202220970829U CN 218006569 U CN218006569 U CN 218006569U
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Abstract
The utility model discloses a constant current drive circuit, constant current power supply and constant current LED lamps and lanterns, constant current drive circuit set up in the drive power supply of LED lamp with between the LED lamp, constant current drive circuit includes voltage stabilizing circuit, reference voltage circuit, a switch circuit, control module, the drive current of LED lamp is inputed in control module's input in real time, and based on drive current's amplitude size, the reference voltage's that control reference voltage circuit provided amplitude size, reference voltage's amplitude size influences the change of voltage stabilizing circuit on-time, voltage stabilizing circuit on-time's change will arouse drive power supply's opto-coupler isolation chip on-time, thereby drive power supply feedback adjusts drive current's size.
Description
Technical Field
The utility model relates to a LED lamp technical field, concretely relates to constant current drive circuit, constant current power supply and constant current LED lamps and lanterns.
Background
LED lighting is generally dominated by white-emitting and super-white LEDs. With the mature and continuous development of white light LED technology, LED lighting has gradually become the mainstream of lighting industry. In particular, some developed countries such as europe and the united states have LED to popularization of LED lighting. The LED lighting not only has the advantages of low power consumption, long service life, low heat radiation, stable light emission and the like, but also has the modern development concepts of low pollution, environmental protection and the like. Since the electrical characteristics of an LED are such that its light output is proportional to the drive current, the qualitative requirements on the drive power supply are high. If the LED operates at a non-constant current, unstable light emission, poor illumination effect, easy damage and reduced service life may result. Therefore, a stable and reliable driving circuit is one of the cores in the LED lighting device. At present, the LED drive circuits are various, and different matched drive circuits are needed according to different factors such as input voltage, input power grid, output voltage, output current and the like. There are a step-up type and a step-down type; isolated and non-isolated, and the like. They all share the common feature of requiring a constant current to drive the LED.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the inconstant defect of the drive current of the LED lamp among the prior art to a constant current drive circuit, constant current power supply and constant current LED lamps and lanterns are provided.
In order to achieve the above purpose, the utility model provides a following technical scheme:
in a first aspect, an embodiment of the present invention provides a constant current driving circuit, which is disposed between a driving power supply of an LED lamp and the LED lamp, and is used for driving the LED lamp to operate in a constant current state, wherein the constant current driving circuit includes: the LED lamp driving circuit comprises a voltage stabilizing circuit, a reference voltage circuit, a first switch circuit and a control module, wherein a first power supply end of a driving power supply is connected with a first end of an LED lamp, a second power supply end of the driving power supply is grounded, and a first feedback end of the driving power supply is connected with a first power supply end of the driving power supply; the first end of the voltage stabilizing circuit is connected with the second power supply end of the driving power supply, and the second end of the voltage stabilizing circuit is connected with the second feedback end of the driving power supply; the first end of the reference voltage circuit is connected with the third power supply end of the driving power supply, the second end of the reference voltage circuit is connected with the first power supply end of the driving power supply, the third end of the reference voltage circuit is connected with the third end of the voltage stabilizing circuit, and the fourth end of the reference voltage circuit is grounded; the first end of the first switch circuit is connected with the second end of the LED lamp, and the second end of the first switch circuit is grounded; the input end of the control module is connected with the third end of the first switch circuit, the first output end of the control module is connected with the control end of the first switch circuit, and the second output end of the control module is connected with the control end of the reference voltage circuit.
In one embodiment, a voltage regulator circuit includes: the voltage regulator tube comprises a voltage regulator tube and a first capacitor, wherein the anode of the voltage regulator tube is connected with the second power supply end of the driving power supply, the cathode of the voltage regulator tube is connected with the second feedback end of the driving power supply and the first end of the first capacitor, and the reference end of the voltage regulator tube is connected with the second end of the first capacitor and the third end of the reference voltage circuit.
In one embodiment, a reference voltage circuit includes: the first end of the second switch circuit is connected with the third power supply end of the driving power supply, the second end of the second switch circuit is connected with the first end of the energy storage circuit, and the control end of the second switch circuit is connected with the second output end of the control module; the second end of the energy storage circuit is connected with the first power supply end of the driving power supply, the third end of the energy storage circuit is connected with the third end of the voltage stabilizing circuit, and the fourth end of the energy storage circuit is grounded.
In one embodiment, the second switching circuit includes: the energy storage device comprises a first resistor, a second resistor and a first switch tube, wherein the first end of the first switch tube is connected with the third power supply end of the driving power supply, the second end of the first switch tube is connected with the first end of the energy storage circuit through the first resistor, the control end of the first switch tube is connected with the third power supply end of the driving power supply through the second resistor, and the control end of the first switch tube is further connected with the second output end of the control module.
In one embodiment, the tank circuit comprises: the first end of the second capacitor is connected with the second end of the second switch circuit, and the second end of the second capacitor is grounded; the first end of the third resistor is connected with the first end of the second capacitor through a fourth resistor, and the first end of the third resistor is also connected with the first end of the sixth resistor and the third end of the voltage stabilizing circuit through a fifth resistor respectively; and the second end of the sixth resistor is connected with the first power supply end of the driving power supply.
In one embodiment, the first switching circuit includes: the LED lamp comprises a second switch tube, a seventh resistor, an eighth resistor and a ninth resistor, wherein the first end of the second switch tube is connected with the second end of the LED lamp, the second end of the second switch tube is grounded through the seventh resistor, the second end of the second switch tube is connected with the input end of the control module, the second end of the second switch tube is connected with the control end of the second switch tube through the eighth resistor, and the control end of the second switch tube is connected with the first output end of the control module through the ninth resistor.
In a second aspect, an embodiment of the present invention provides a constant current power supply, including a driving power supply and the constant current driving circuit of the first aspect.
The third aspect, the embodiment of the utility model provides a constant current LED lamps and lanterns, including the LED lamp, still include: the constant current power supply of the second aspect.
In one embodiment, the LED lamps are multiple and are connected in series to form a lamp string.
In one embodiment, the light string is multiple and is arranged in parallel.
The utility model discloses technical scheme has following advantage:
the utility model provides a constant current drive circuit, set up in the drive power supply of LED lamp with between the LED lamp, constant current drive circuit includes voltage stabilizing circuit, reference voltage circuit, a switch circuit, a control module, the drive current of LED lamp is inputed in control module's input in real time, and based on drive current's amplitude size, the reference voltage's that control reference voltage circuit provided amplitude size, reference voltage's amplitude size influences the change of voltage stabilizing circuit on-time, voltage stabilizing circuit on-time's change will arouse drive power supply's opto-coupler isolation chip on-time, thereby drive power supply feedback adjusts drive current's size.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a composition diagram of a specific example of a constant current driving circuit and a constant current power supply provided by an embodiment of the present invention;
fig. 2 is a specific circuit structure diagram of a driving power supply provided by an embodiment of the present invention;
fig. 3 is a specific circuit structure diagram of the constant current driving circuit provided in the embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the utility model provides a constant current drive circuit sets up between the drive power supply of LED lamp and LED lamp for drive LED lamp work is at the constant current state, as shown in fig. 1, constant current drive circuit includes: the circuit comprises a voltage stabilizing circuit 11, a reference voltage circuit 12, a first switch circuit 13 and a control module 14.
As shown in fig. 1, a first power supply end of the driving power supply is connected with a first end of the LED lamp, a second power supply end of the driving power supply is grounded, and a first feedback end of the driving power supply is connected with the first power supply end thereof; the first end of the voltage stabilizing circuit 11 is connected with the second power supply end of the driving power supply, and the second end of the voltage stabilizing circuit 11 is connected with the second feedback end of the driving power supply; the first end of the reference voltage circuit 12 is connected with the third power supply end of the driving power supply, the second end of the reference voltage circuit 12 is connected with the first power supply end of the driving power supply, the third end of the reference voltage circuit 12 is connected with the third end of the voltage stabilizing circuit 11, and the fourth end of the reference voltage circuit 12 is grounded; a first end of the first switch circuit 13 is connected with a second end of the LED lamp, and a second end of the first switch circuit 13 is grounded; an input end of the control module 14 is connected to a third end of the first switch circuit 13, a first output end of the control module 14 is connected to a control end of the first switch circuit 13, and a second output end of the control module 14 is connected to a control end of the reference voltage circuit 12.
Specifically, the utility model discloses drive power supply can be the mature switching power supply who has feedback regulatory function among the prior art, and specific topological structure can be the circuit structure shown in fig. 2, and the both ends of the emitting diode of chip U2 are kept apart to the opto-coupler are first feedback end, second feedback end respectively, and it is required to explain that the topology shown in fig. 2 is only used for the example, but does not use this as the restriction.
Specifically, the utility model discloses the drive current of the real-time input LED lamp of control module 14's input to based on drive current's amplitude size, the amplitude size of the reference voltage that control reference voltage circuit 12 provided, reference voltage's amplitude size influences the change of voltage stabilizing circuit 11 on-time, and the change of voltage stabilizing circuit 11 on-time will arouse switching power supply's opto-coupler isolation chip on-time, thereby switching power supply feedback regulation drive current's size.
Illustratively, when the driving current increases, the control module 14 controls the amplitude of the reference voltage provided by the reference voltage circuit 12 to increase, so that the on-time of the voltage stabilizing circuit 11 increases, the on-time of the opto-isolator chip in the switching power supply increases, and the driving current output by the switching power supply decreases through feedback regulation; when the driving current is reduced, the control module 14 controls the amplitude of the reference voltage provided by the reference voltage circuit 12 to be reduced, so that the conduction time of the voltage stabilizing circuit 11 is reduced, the conduction time of the optical coupling isolation chip in the switching power supply is shortened, and the driving current output by the switching power supply is increased through feedback regulation.
Further, the control module 14 of the embodiment of the present invention may include: the current sampling circuit collects driving current in real time, the current comparison circuit compares the driving current with a preset current threshold, when the driving current is larger than the preset current threshold, the current comparison circuit outputs a first charging signal, the first charging signal controls energy storage charging inside the reference voltage circuit 12, when the driving current is smaller than the preset current threshold, the current comparison circuit outputs a second charging signal, the second charging signal controls energy storage charging inside the reference voltage circuit 12, wherein the charging time corresponding to the first charging signal is longer than that corresponding to the second charging signal, so that when the driving current is larger than the preset current threshold, the reference voltage provided by the reference voltage circuit 12 is increased, and when the driving current is smaller than the preset current threshold, the reference voltage provided by the reference voltage circuit 12 is decreased.
It should be noted that the control circuit of the embodiment of the present invention may be an analog circuit, may also be a digital circuit, and when the control circuit is a digital circuit, it may be an MCU, and is not limited herein.
In one embodiment, as shown in FIG. 3, the voltage regulator circuit 11 includes: a voltage regulator tube U4 and a first capacitor C6, wherein the anode of the voltage regulator tube U4 is connected to the second power supply end of the driving power supply, the cathode of the voltage regulator tube U4 is connected to the second feedback end of the driving power supply (actually connected to an opto-coupled isolation chip in the driving power supply) and the first end of the first capacitor C6, and the reference end of the voltage regulator tube U4 is connected to the second end of the first capacitor C6 and the third end of the reference voltage circuit 12 (one end of the fifth resistor R3 and one end of the sixth resistor R2).
Specifically, the utility model discloses stabilivolt U4 can adopt TL431, when first reference voltage is greater than second reference voltage, because its inside feedback adjusts the process of steady voltage, leads to the regulation time that first reference voltage corresponds to be greater than the regulation time that second reference voltage corresponds, and the conduction time of stabilivolt U4 that first reference voltage corresponds is greater than the conduction time of stabilivolt U4 that second reference voltage corresponds promptly.
In one embodiment, the reference voltage circuit 12 includes: a first end of the second switch circuit is connected with a third power supply end of the driving power supply, a second end of the second switch circuit is connected with a first end of the energy storage circuit, and a control end of the second switch circuit is connected with a second output end of the control module 14; the second terminal of the tank circuit is connected to the first power supply terminal (VCC terminal in fig. 3) of the driving power supply, the third terminal of the tank circuit is connected to the third terminal of the voltage stabilizing circuit 11 (the second terminal of the first capacitor C6 in fig. 3), and the fourth terminal of the tank circuit is grounded.
Specifically, the utility model discloses control module 14 of embodiment is through the opening time of controlling the second switch circuit to control tank circuit's charge time.
Illustratively, when the driving current is greater than the preset current threshold, the control module 14 controls the second switch circuit to be continuously turned on for a first preset time, and the charging time of the energy storage circuit is the first preset time, and when the driving current is less than the preset current threshold, the control module 14 controls the second switch circuit to be continuously turned on for a second preset time, and the charging time of the energy storage circuit is the second preset time, where the first preset time is greater than the second preset time, and thus, in the two cases, the amplitude of the reference voltage provided after the charging of the energy storage circuit is completed is different.
In one embodiment, as shown in fig. 3, the second switching circuit includes: the driving circuit comprises a first resistor R6, a second resistor R7 and a first switching tube Q1, wherein the first end of the first switching tube Q1 is connected with a third power supply end (+ 5 end) of the driving power supply, the second end of the first switching tube Q1 is connected with the first end of the energy storage circuit (one end of the second capacitor C7) through the first resistor R6, the control end (A1 end) of the first switching tube Q1 is connected with the third power supply end (+ 5 end) of the driving power supply through the second resistor R7, and the control end (A1 end) of the first switching tube Q1 is further connected with a second output end (not shown in the figure) of the control module 14.
As shown in fig. 3, the tank circuit includes: a third resistor R5, a fourth resistor R4, a fifth resistor R3, a sixth resistor R2, and a second capacitor C7, wherein a first end of the second capacitor is connected to a second end of the second switch circuit (i.e., one end of the first resistor R6), and a second end of the second capacitor is grounded; the first end of the third resistor is connected with the first end of the second capacitor through a fourth resistor, and the first end of the third resistor is also connected with the first end of the sixth resistor and the third end of the voltage stabilizing circuit 11 (namely, one end of the first capacitor C6) through a fifth resistor; the second terminal of the sixth resistor is connected to the first power supply terminal (i.e., VCC terminal) of the driving power supply.
Specifically, when the second switch tube is turned on, the +5V voltage charges the second capacitor, and when the voltage on the second capacitor increases, the increased voltage on the second capacitor is superposed to the P1 port through the third resistor, so that the reference terminal voltage of the TL431 is pulled high; when the voltage on the second capacitor decreases, the rising voltage on the second capacitor is added to the P1 port through the third resistor, so that the reference voltage of the TL431 is pulled low.
In one embodiment, as shown in fig. 3, the first switch circuit 13 includes: the second switch tube Q2, a seventh resistor R10, an eighth resistor R9 and a ninth resistor R8, wherein the first end of the second switch tube Q2 is connected to the second end of the LED lamp, the second end of the second switch tube Q2 is grounded through the seventh resistor R10, the second end of the second switch tube Q2 is further connected to the input end (end A3) of the control module 14, the second end of the second switch tube Q2 is further connected to the control end thereof through the eighth resistor R9, and the control end of the second switch tube Q2 is connected to the first output end (end A2) of the control module 14 through the ninth resistor R8.
Specifically, the utility model discloses the control module 14 accessible control second switch tube Q2 switch on and turn off opening and closing of control LED lamp, in addition, the drive current of LED lamp passes through A3 end input to control module 14, control module 14 compares drive current with predetermineeing the current threshold value (this predetermine the constant current value that the current threshold value can be set for by the demand), when drive current is greater than predetermineeing the current threshold value, control module 14 controls first switch tube Q1 and switches on first default time, when drive current is less than predetermineeing the current threshold value, control module 14 controls first switch tube Q1 and switches on the second default time, first default time is greater than the second default time, thereby the charge time of second electric capacity is different, the stack is different to the reference voltage of P1 mouth. When the driving current is greater than the preset current threshold, the reference voltage of the voltage-regulator tube U4 is recorded as a first reference voltage, when the driving current is less than the preset current threshold, the reference voltage of the voltage-regulator tube U4 is recorded as a second reference voltage, as can be seen from the above, the first reference voltage is greater than the second reference voltage, the conduction time of the voltage-regulator tube U4 corresponding to the first reference voltage is greater than the conduction time of the voltage-regulator tube U4 corresponding to the second reference voltage, the conduction time of the optical coupling isolation chip corresponding to the first reference voltage is greater than the conduction time of the optical coupling isolation chip corresponding to the second reference voltage, and the feedback regulation is started based on the conduction time of the optical coupling isolation chip in the driving power supply, so as to realize the regulation of the output driving current and maintain the constancy of the driving current.
Exemplarily, use fig. 3 as an example, the utility model discloses control module 14 can be MCU, and when the LED lamp was opened, there was the electric current to flow through on the R10 resistance, MCU's AD sample connection A3 end has the pressure drop, and outside MCU detects the voltage of A3 mouth and calculates the electric current that flows through the LED banks according to ohm's law.
According to the set preset current threshold, when the driving current flowing through the LED becomes large, the external MCU increases the PWM duty ratio signal, and improves the opening time of the Q1 through the A1 port, so that the charging time of the capacitor C7 is prolonged. When the voltage on the C7 capacitor increases, the increased voltage on C7 is added to the P1 port through the resistor, so that the reference voltage of the TL431 increases, the TL431 on-time changes again, and finally the driving voltage VCC (i.e., the driving current) of the LED lamp decreases.
When the current flowing through the LED lamp is small, the external MCU reduces the PWM duty ratio signal and reduces the opening time of the Q1 through the A1 port, thereby reducing the charging time of the capacitor C7. When the voltage on the C7 capacitor decreases, the increased voltage on C7 is added to the P1 port through the resistor, so that the reference voltage of the TL431 decreases, the TL431 on-time changes again, and finally the driving voltage VCC (i.e., the driving current) of the LED increases.
It should be noted that the method for adjusting the duty ratio of the PWM wave by the control module 14 according to the embodiment of the present invention is a mature PWM modulation method in the prior art, and is not described herein again.
Example 2
An embodiment of the present invention provides a constant current power supply, as shown in fig. 1, including a driving power supply and the constant current driving circuit of embodiment 1.
Specifically, the driving power supply of the embodiment of the present invention may be a flyback switching power supply with automatic feedback adjustment, and the specific circuit topology thereof may be the structure shown in fig. 2. The constant current driving circuit collects driving current flowing through the LED lamp in real time, when the driving current is increased, the conduction time of a voltage stabilizing tube U4 in the constant current driving circuit is prolonged, so that the conduction time of an optical coupling isolation chip in a driving power supply is prolonged, and the driving voltage output by the switching power supply is reduced; when the driving current is reduced, the conduction time of a voltage stabilizing tube U4 in the constant current driving circuit is reduced, so that the conduction time of an optical coupling isolation chip in the driving power supply is reduced, and the driving voltage output by the switching power supply is increased.
As shown in fig. 1, the constant current drive circuit includes: the circuit comprises a voltage stabilizing circuit 11, a reference voltage circuit 12, a first switch circuit 13 and a control module 14. The utility model discloses the drive current of the real-time input LED lamp of control module 14's input to based on drive current's amplitude size, the reference voltage's that control reference voltage circuit 12 provided amplitude size, reference voltage's amplitude size influences the change of voltage stabilizing circuit 11 on-time, and the change of voltage stabilizing circuit 11 on-time will arouse switching power supply's opto-coupler isolation chip on-time, thereby switching power supply feedback regulation drive current's size.
Illustratively, when the driving current increases, the control module 14 controls the amplitude of the reference voltage provided by the reference voltage circuit 12 to increase, so that the conduction time of the voltage stabilizing circuit 11 increases, the conduction time of the optical coupling isolation chip in the switching power supply increases, and the driving current output by the switching power supply decreases through feedback regulation; when the driving current is reduced, the control module 14 controls the amplitude of the reference voltage provided by the reference voltage circuit 12 to be reduced, so that the conduction time of the voltage stabilizing circuit 11 is reduced, the conduction time of the optical coupling isolation chip in the switching power supply is shortened, and the driving current output by the switching power supply is increased through feedback regulation.
Example 3
The embodiment of the utility model provides a constant current LED lamps and lanterns, including the LED lamp, still include: constant current power supply of example 2. The constant current power supply realizes self-feedback regulation based on the driving current flowing through the LED lamp to output constant driving voltage/current. The LED lamps are connected in series to form a lamp string, and the lamp strings are connected in parallel.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. A constant current driving circuit is arranged between a driving power supply of an LED lamp and the LED lamp and used for driving the LED lamp to work in a constant current state, and is characterized by comprising: a voltage stabilizing circuit, a reference voltage circuit, a first switch circuit and a control module, wherein,
a first power supply end of the driving power supply is connected with a first end of the LED lamp, a second power supply end of the driving power supply is grounded, and a first feedback end of the driving power supply is connected with the first power supply end of the driving power supply;
the first end of the voltage stabilizing circuit is connected with the second power supply end of the driving power supply, and the second end of the voltage stabilizing circuit is connected with the second feedback end of the driving power supply;
the first end of the reference voltage circuit is connected with the third power supply end of the driving power supply, the second end of the reference voltage circuit is connected with the first power supply end of the driving power supply, the third end of the reference voltage circuit is connected with the third end of the voltage stabilizing circuit, and the fourth end of the reference voltage circuit is grounded;
the first end of the first switch circuit is connected with the second end of the LED lamp, and the second end of the first switch circuit is grounded;
the input end of the control module is connected with the third end of the first switch circuit, the first output end of the control module is connected with the control end of the first switch circuit, and the second output end of the control module is connected with the control end of the reference voltage circuit.
2. The constant current drive circuit of claim 1, wherein the voltage regulator circuit comprises: a voltage regulator tube and a first capacitor, wherein,
the anode of the voltage-regulator tube is connected with the second power supply end of the driving power supply, the cathode of the voltage-regulator tube is connected with the second feedback end of the driving power supply and the first end of the first capacitor, and the reference end of the voltage-regulator tube is connected with the second end of the first capacitor and the third end of the reference voltage circuit.
3. The constant current drive circuit according to claim 2, wherein the reference voltage circuit includes: a second switching circuit and a tank circuit, wherein,
the first end of the second switch circuit is connected with the third power supply end of the driving power supply, the second end of the second switch circuit is connected with the first end of the energy storage circuit, and the control end of the second switch circuit is connected with the second output end of the control module;
the second end of the energy storage circuit is connected with the first power supply end of the driving power supply, the third end of the energy storage circuit is connected with the third end of the voltage stabilizing circuit, and the fourth end of the energy storage circuit is grounded.
4. The constant current drive circuit according to claim 3, wherein the second switch circuit comprises: a first resistor, a second resistor and a first switch tube, wherein,
the first end of the first switch tube is connected with the third power supply end of the driving power supply, the second end of the first switch tube is connected with the first end of the energy storage circuit through the first resistor, the control end of the first switch tube is connected with the third power supply end of the driving power supply through the second resistor, and the control end of the first switch tube is further connected with the second output end of the control module.
5. The constant current drive circuit according to claim 3, wherein the tank circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a second capacitor, wherein,
the first end of the second capacitor is connected with the second end of the second switch circuit, and the second end of the second capacitor is grounded;
the first end of the third resistor is connected with the first end of the second capacitor through the fourth resistor, and the first end of the third resistor is also respectively connected with the first end of the sixth resistor and the third end of the voltage stabilizing circuit through the fifth resistor;
and the second end of the sixth resistor is connected with the first power supply end of the driving power supply.
6. The constant current drive circuit according to claim 3, wherein the first switch circuit includes: a second switch tube, a seventh resistor, an eighth resistor and a ninth resistor, wherein,
the first end of the second switch tube is connected with the second end of the LED lamp, the second end of the second switch tube is grounded through the seventh resistor, the second end of the second switch tube is connected with the input end of the control module, the second end of the second switch tube is connected with the control end of the eighth resistor, and the control end of the second switch tube is connected with the first output end of the control module through the ninth resistor.
7. A constant current power supply comprising a drive power supply and the constant current drive circuit according to any one of claims 1 to 6.
8. The constant current LED lamp is characterized by comprising an LED lamp and further comprising: the constant current power supply of claim 7.
9. The constant-current LED lamp according to claim 8, wherein the LED lamps are connected in series to form a string.
10. The constant current LED lamp of claim 9, wherein the string of lights is a plurality of strings connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220970829.4U CN218006569U (en) | 2022-04-25 | 2022-04-25 | Constant current drive circuit, constant current power supply and constant current LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220970829.4U CN218006569U (en) | 2022-04-25 | 2022-04-25 | Constant current drive circuit, constant current power supply and constant current LED lamp |
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| Publication Number | Publication Date |
|---|---|
| CN218006569U true CN218006569U (en) | 2022-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220970829.4U Active CN218006569U (en) | 2022-04-25 | 2022-04-25 | Constant current drive circuit, constant current power supply and constant current LED lamp |
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| CN (1) | CN218006569U (en) |
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2022
- 2022-04-25 CN CN202220970829.4U patent/CN218006569U/en active Active
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