CN220254721U - LED constant current drive circuit - Google Patents
LED constant current drive circuit Download PDFInfo
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- CN220254721U CN220254721U CN202321859033.2U CN202321859033U CN220254721U CN 220254721 U CN220254721 U CN 220254721U CN 202321859033 U CN202321859033 U CN 202321859033U CN 220254721 U CN220254721 U CN 220254721U
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Abstract
The utility model discloses an LED constant current driving circuit, which comprises a lamp string formed by sequentially connecting a plurality of light emitting diodes in series; the positive electrode of the lamp string is connected with the common-cathode rectifying module, and the negative electrode of the lamp string is connected with the common-anode rectifying module; the lamp string comprises two lamp groups, the output ends of the two lamp groups are respectively connected with a constant current control chip IC1 and a constant current control chip IC2, and the constant current control chip IC1 is connected with the sampling end of the constant current control chip IC 2. Because bridge stacks of the rectifier bridge are split at two ends of the light string, the light string is effectively separated from positive and negative wires in a design circuit board, and the risks of discharge and short circuit are reduced; in addition, the circuit ensures the working stability of the lamp string, reduces the generation of abnormal waves and improves the harmonic current of the circuit through the control of the constant current control chip on the lamp set.
Description
Technical Field
The utility model relates to an LED lamp control circuit, in particular to an LED constant current driving circuit.
Background
In the lighting industry, many LED lighting devices are composed of an LED strip and a converter, the converter is typically a rectifier bridge, and a common rectifier bridge is installed at one end of the LED strip, so that the power of the LED strip is limited, the load of the LED strip is limited by the rectifier bridge, and electric leakage is caused by insufficient electric gap; meanwhile, in the testing process of the LED lamp strip, a plurality of LEDs are generally connected in series for testing in order to improve efficiency, so that the voltage required to be conducted is high, the current waveform is distorted, and the LED lamp strip is unstable in lighting.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides an LED constant current driving circuit.
The technical scheme adopted for solving the technical problems is as follows:
an LED constant current driving circuit comprises a light string formed by sequentially connecting a plurality of light emitting diodes in series; the anode of the lamp string is connected with the common cathode rectifying module, and the cathode of the lamp string is connected with the common anode rectifying module; the light string comprises two light groups, wherein the output ends of the two light groups are respectively connected with a constant current control chip IC1 and a constant current control chip IC2, and the constant current control chip IC1 is connected with the sampling end of the constant current control chip IC 2.
The common-cathode rectifying module consists of a rectifying diode D1 and a rectifying diode D2, the common-anode rectifying module consists of a rectifying diode D3 and a rectifying diode D4, the output ends of the rectifying diode D1 and the rectifying diode D2 are connected with the anode of the lamp string, and the input ends of the rectifying diode D1 and the rectifying diode D2 are respectively connected with two power supplies AC with different polarities; the negative pole of the light string is connected with the input ends of the rectifying diode D3 and the rectifying diode D4 respectively, and the output ends of the rectifying diode D3 and the rectifying diode D4 are connected with two power supplies AC with different polarities respectively.
Any one of the two power supplies AC with different polarities is a positive main power line.
The light emitting diode LED1 and the light emitting diode LED2 form a first lamp group, the light emitting diode LED3 and the light emitting diode LED4 form a second lamp group, and the first lamp group is connected with the second lamp group; the internal structure of the constant current control chip IC1 is composed of a constant current source module U1 and a triode Q1, the internal structure of the constant current control chip IC2 is composed of a constant current source module U2 and a triode Q2, the negative electrode of the first lamp group is connected with the 1 st pin of the constant current source module U1, the negative electrode of the second lamp group is connected with the 1 st pin of the constant current source module U2, the 3 rd pin of the constant current source module U1 is connected with the 3 rd pin of the constant current source module U2 through a resistor R1, the triode Q1 and the triode Q2 are respectively connected between the 1 st pin and the 3 rd pin of the constant current source module U1 and the 3 rd pin of the constant current source module U2, the 2 nd pins of the constant current source module U1 and the constant current source module U2 are respectively connected with the base electrodes of the triode Q1 and the triode Q2, and the 3 rd pin of the constant current source module U2 is grounded through the resistor R2.
The beneficial effects of the utility model are as follows: the anode of the light string is connected with the common cathode rectifying module, and the cathode of the light string is connected with the common anode rectifying module, so that the bridge pile of the rectifying bridge is split at two ends of the light string, and the light string is effectively separated from the positive and negative wires in a designed circuit board, thereby reducing the risks of discharge and short circuit; in addition, the light string can be composed of a plurality of light groups, the output end of each light group is connected with a constant current control chip, the sampling ends of the adjacent constant current control chips are connected, the light groups are controlled by the constant current control chips, the work stability of the light string is ensured, the generation of abnormal waves is reduced, and the harmonic current of a circuit is improved.
Drawings
The utility model will be further described with reference to the drawings and examples.
Fig. 1 is a circuit diagram of the present utility model.
Detailed Description
The objects, technical solutions and advantages of the present utility model will become more apparent by the following detailed description of the present utility model with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.
It is to be understood that this description is merely exemplary in nature and is not intended to limit the scope of the present utility model.
Referring to fig. 1, an LED constant current driving circuit includes a light string formed by sequentially connecting a plurality of light emitting diodes in series; the anode of the lamp string is connected with the common cathode rectifying module, and the cathode of the lamp string is connected with the common anode rectifying module; the light string comprises two light groups (the two light groups are adopted in the embodiment, and can be infinite), the output ends of the two light groups are respectively connected with a constant current control chip IC1 and a constant current control chip IC2, and the constant current control chip IC1 is connected with the sampling end of the constant current control chip IC 2.
The common-cathode rectifying module consists of a rectifying diode D1 and a rectifying diode D2, the common-anode rectifying module consists of a rectifying diode D3 and a rectifying diode D4, the output ends of the rectifying diode D1 and the rectifying diode D2 are connected with the anode of the lamp string, and the input ends of the rectifying diode D1 and the rectifying diode D2 are respectively connected with two power supplies AC with different polarities; the cathodes of the light string are respectively connected with the input ends of the rectifying diode D3 and the rectifying diode D4, and the output ends of the rectifying diode D3 and the rectifying diode D4 are respectively connected with two power supplies AC with different polarities; any one of the two power supplies AC with different polarities is an anode main power line, and as the bridge pile of the rectifier bridge is split at the two ends of the light string, the light emitting diode in the light string is convenient to extend, and in a designed circuit board, the light string is effectively separated from the anode and cathode wires, so that the risks of discharging and short circuit are reduced.
The light emitting diode LED1 and the light emitting diode LED2 form a first lamp group (a plurality of light emitting diodes can be connected in series between the light emitting diode LED1 and the light emitting diode LED 2), the light emitting diode LED3 and the light emitting diode LED4 form a second lamp group (a plurality of light emitting diodes can be connected in series between the light emitting diode LED3 and the light emitting diode LED 4), and the first lamp group is connected with the second lamp group; in this embodiment, the constant current control chip IC1 and the constant current control chip IC2 adopt RM9005G type chips, the internal structure of the constant current control chip IC1 is composed of a constant current source module U1 and a triode Q1, the internal structure of the constant current control chip IC2 is composed of a constant current source module U2 and a triode Q2, the negative electrode of the first lamp group is connected with the 1 st pin of the constant current source module U1, the negative electrode of the second lamp group is connected with the 1 st pin of the constant current source module U2, the 3 rd pin of the constant current source module U1 is connected with the 3 rd pin of the constant current source module U2 through a resistor R1, the 1 st pin and the 3 rd pin of the constant current source module U1 are respectively connected with the triode Q1 and the triode Q2, the 2 nd pins of the constant current source module U1 and the constant current source module U2 are respectively connected with the base of the triode Q1 and the triode Q2, and the 3 rd pin of the constant current source module U2 is grounded through the resistor R2.
Working principle: when the input voltage is smaller than the total voltage of the lamp string and larger than the first lamp group voltage, the constant current source module U1 works, and the light emitting diode LED1, the light emitting diode LED2, the triode Q1, the resistor R1 and the resistor R2 form a loop, so that the light emitting diode LED1 and the light emitting diode LED2 are lightened; when the input voltage is exactly equal to the total voltage of the lamp string, the constant current source module U1 and the constant current source module U2 work simultaneously, and the whole lamp string is lighted; when the input voltage saturates the total voltage of the lamp string, the constant current source module U1 stops working, the constant current source module U2 continues working, the lamp string keeps on shining, the working stability of the lamp string is ensured, the generation of abnormal waves is reduced, and the harmonic current of the circuit is improved.
In the present utility model, the term "plurality" means two or more, unless explicitly defined otherwise. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "mounted," "connected," "secured," and the like are to be construed broadly, as they are used in a fixed or removable connection, or as they are integral with one another, as they are directly or indirectly connected through intervening media. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
It will be understood that when an element is referred to as being "mounted," "secured" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.
Claims (4)
1. An LED constant current driving circuit comprises a light string formed by sequentially connecting a plurality of light emitting diodes in series; the LED lamp is characterized in that the anode of the lamp string is connected with a common cathode rectifying module, and the cathode of the lamp string is connected with a common anode rectifying module; the light string comprises two light groups, wherein the output ends of the two light groups are respectively connected with a constant current control chip IC1 and a constant current control chip IC2, and the constant current control chip IC1 is connected with the sampling end of the constant current control chip IC 2.
2. The LED constant current driving circuit according to claim 1, wherein the common cathode rectifying module consists of a rectifying diode D1 and a rectifying diode D2, the common anode rectifying module consists of a rectifying diode D3 and a rectifying diode D4, the output ends of the rectifying diode D1 and the rectifying diode D2 are connected with the positive electrode of the light string, and the input ends are respectively connected with two power supplies AC with different polarities; the negative pole of the light string is connected with the input ends of the rectifying diode D3 and the rectifying diode D4 respectively, and the output ends of the rectifying diode D3 and the rectifying diode D4 are connected with two power supplies AC with different polarities respectively.
3. The LED constant current driving circuit according to claim 2, wherein any one of the two power supplies AC of different polarities is a positive main power supply line.
4. The LED constant current driving circuit according to claim 1, wherein the light emitting diode LED1 and the light emitting diode LED2 form a first lamp group, the light emitting diode LED3 and the light emitting diode LED4 form a second lamp group, and the first lamp group is connected with the second lamp group; the internal structure of the constant current control chip IC1 is composed of a constant current source module U1 and a triode Q1, the internal structure of the constant current control chip IC2 is composed of a constant current source module U2 and a triode Q2, the negative electrode of the first lamp group is connected with the 1 st pin of the constant current source module U1, the negative electrode of the second lamp group is connected with the 1 st pin of the constant current source module U2, the 3 rd pin of the constant current source module U1 is connected with the 3 rd pin of the constant current source module U2 through a resistor R1, the triode Q1 and the triode Q2 are respectively connected between the 1 st pin and the 3 rd pin of the constant current source module U1 and the 3 rd pin of the constant current source module U2, the 2 nd pins of the constant current source module U1 and the constant current source module U2 are respectively connected with the base electrodes of the triode Q1 and the triode Q2, and the 3 rd pin of the constant current source module U2 is grounded through the resistor R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321859033.2U CN220254721U (en) | 2023-07-15 | 2023-07-15 | LED constant current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321859033.2U CN220254721U (en) | 2023-07-15 | 2023-07-15 | LED constant current drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220254721U true CN220254721U (en) | 2023-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321859033.2U Active CN220254721U (en) | 2023-07-15 | 2023-07-15 | LED constant current drive circuit |
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| CN (1) | CN220254721U (en) |
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2023
- 2023-07-15 CN CN202321859033.2U patent/CN220254721U/en active Active
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