LED light source module and LED light source

Abstract

The utility model provides an LED light source module and an LED light source. The LED light source module comprises at least one lighting unit, an LED control unit and at least one switch unit, wherein the LED control unit is used for correspondingly outputting a control signal according to a received single-line return-to-zero code signal; the switch unit is used for controlling the lighting unit to be turned on or turned off according to the control signal output by the LED control unit; according to the LED light source module, the stroboscopic problem generated by an LED due to a pulse signal can be avoided, the light source can provide an illumination function for a camera, a plurality of LED light source modules can be connected in a cascade connection mode, and multi-path illumination modules can be controlled through a single signal.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting equipment, and more specifically, it relates to an LED light source module and an LED light source. Background Art

[0002] In the industry, when an intelligent industrial machine device is used to perform on-line inspection of cloth, a light source is required for assistance. Due to the special structure of the loom, the existing light sources all use forward or lateral lighting on the cloth surface to assist in photographing and imaging, and there is no light source (abbreviated as backlight) that can be placed behind the cloth at the weft insertion point to assist in lighting. The schematic diagram is as Figure 1 shown.

[0003] In the industry, there have also been attempts to use flat light sources to provide backlight lighting methods, but such light sources are expensive and cannot achieve a thickness less than 1 mm, so they cannot be implemented. If the scheme of placing a mature strip light on the loom is adopted, although the brightness adjustment and variable length functions of the strip light can be realized, the stroboscopic effect brought by the driving method still affects the imaging of a high-speed camera with a short exposure time. The so-called flicker-free strip light is actually described from the perspective of the human eye and is not applicable to cameras. Content of the Utility Model

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the present utility model is to provide an LED light source module and an LED light source to overcome the shortcoming that the existing LED flicker-free light source cannot be applied to cameras in the prior art.

[0005] The above technical purpose of the present utility model is achieved through the following technical solutions: An LED light source module, characterized in that it includes: at least one lighting unit, an LED control unit for correspondingly outputting a control signal according to the received single-line return-to-zero code signal, and at least one switching unit for controlling the on and off of the lighting unit according to the control signal output by the LED control unit; the input ends of at least one switching unit are all connected to the first output end of the LED control unit; the LED control unit further includes a second output end for connecting to the input end of an adjacent LED control unit; the output ends of at least one of the switching units are correspondingly connected to the input ends of at least one lighting unit one by one.

[0006] Optionally, the LED control unit includes: an LED control chip, a first resistor, a second resistor, a third resistor, and a first capacitor; a first pin of the LED control chip is connected to the switch unit; a second pin of the LED control chip is connected to the switch unit; a third pin of the LED control chip is connected to the switch unit; a fourth pin of the LED control chip is grounded; the LED control chip further includes: a fifth pin for connecting to a sixth pin of other LED control chips after passing through the third resistor; a sixth pin of the LED control chip is connected to the input end of the single-line return-to-zero code signal after passing through the second resistor; an eighth pin of the LED control chip is connected to the VCC voltage terminal after passing through the first resistor; the eighth pin of the LED control chip is also grounded after passing through the first resistor and the first capacitor in sequence.

[0007] Optionally, the switch unit includes: a second capacitor, a third capacitor, a fourth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a MOS transistor, a triode, and a fourth light-emitting diode; an anode of the fourth light-emitting diode is connected to the VCC voltage terminal; a cathode of the fourth light-emitting diode is grounded after passing through the tenth resistor and the fourth capacitor in sequence; the cathode of the fourth light-emitting diode is connected to the LED control unit after passing through the tenth resistor; a base of the triode is connected to the LED control unit after passing through the ninth resistor; the base of the triode is grounded after passing through the third capacitor; the base of the triode is grounded after passing through the eighth resistor; an emitter of the triode is grounded; a collector of the triode is connected to a gate of the MOS transistor after passing through the seventh resistor; the gate of the MOS transistor is grounded after passing through the sixth resistor; a source of the MOS transistor is grounded; a drain of the MOS transistor is grounded after passing through the second capacitor; the drain of the MOS transistor is also connected to the lighting unit.

[0008] Optionally, the lighting unit includes: a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, a fourth resistor, and a fifth resistor; an anode of the first light-emitting diode is connected to the VCC voltage terminal; a cathode of the first light-emitting diode is connected to an anode of the second light-emitting diode after passing through the fourth resistor; a cathode of the second light-emitting diode is connected to an anode of the third light-emitting diode after passing through the fifth resistor; a cathode of the third light-emitting diode is connected to the switch unit.

[0009] Optionally, it includes: three lighting units, an LED control unit for correspondingly outputting control signals according to the received single-line return-to-zero code signals, and three switch units for controlling the lighting and extinguishing of the lighting units according to the control signals output by the LED control unit; input ends of the three switch units are all connected to an output end of the LED control unit; the LED control unit further includes a second output end for connecting to an input end of an adjacent LED control unit; outputs of the three switch units are respectively connected to input ends of the three lighting units in one-to-one correspondence.

[0010] An LED light source includes a plurality of LED light source modules; the LED control units of the plurality of LED light source modules are connected end to end in sequence.

[0011] In summary, the present application proposes an LED light source module and an LED light source, including: at least one lighting unit, an LED control unit for correspondingly outputting a control signal according to the received single-line return-to-zero code signal, and at least one switching unit for controlling the on and off of the lighting unit according to the control signal output by the LED control unit; the LED light source module of the present application can avoid the stroboscopic problem caused by the pulse signal, enable the light source of the present application to provide a lighting function for the camera, and can also connect multiple LED light source modules in a cascaded manner to realize single-signal control of multiple lighting modules. Description of the Drawings

[0012] Figure 1 Schematic diagram of the auxiliary light source illumination in the prior art;

[0013] Figure 2 Circuit schematic diagram of the LED control unit of the present invention;

[0014] Figure 3 Circuit schematic diagram of the lighting unit and the switching unit of the present invention;

[0015] Figure 4 Specific structural schematic diagram of the LED light source of the present invention. Detailed Description of the Embodiment

[0016] To make the objectives, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0017] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features.

[0018] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature. Terms such as "vertical", "horizontal", "left", "right", "above", "below" and similar expressions are only for the purpose of illustration, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present utility model.

[0019] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0020] The present utility model provides an LED light source module, as Figure 1 shown, comprising:

[0021] At least one lighting unit, an LED control unit for correspondingly outputting a control signal according to the received single - line return - to - zero code signal, and at least one switching unit for controlling the lighting and extinguishing of the lighting unit according to the control signal output by the LED control unit; the input ends of at least one switching unit are all connected to the first output end of the LED control unit; the LED control unit further includes a second output end for connecting to the input end of an adjacent LED control unit; the output ends of at least one of the switching units are correspondingly connected to the input ends of at least one lighting unit one by one.

[0022] Further, the LED control unit includes:

[0023] An LED control chip, a first resistor, a second resistor, a third resistor and a first capacitor;

[0024] The first pin of the LED control chip is connected to the switching unit;

[0025] The second pin of the LED control chip is connected to the switching unit;

[0026] The third pin of the LED control chip is connected to the switching unit;

[0027] The fourth pin of the LED control chip is grounded;

[0028] The LED control chip further includes: a fifth pin for connecting to the sixth pin of other LED control chips after passing through the third resistor;

[0029] The sixth pin of the LED control chip is connected to the input terminal of the single-line return-to-zero code signal after passing through the second resistor;

[0030] The eighth pin of the LED control chip is connected to the VCC voltage terminal after passing through the first resistor; the eighth pin of the LED control chip is also grounded after passing through the first resistor and the first capacitor in sequence.

[0031] In practical applications, the LED control chip uses a control chip with the model WS2811. The LED control chip is a dedicated LED chip controlled by a single-line return-to-zero code. The data frame received by this chip is 24 bits, which sequentially represents the red, green, and blue color channels of the LED. Each color channel is represented by 8 bits, and from the highest bit to the lowest bit, they represent different brightness levels. Therefore, the entire data frame represents a complete RGB color. In this application, the single-line transmission function of this chip is utilized, and it is not sensitive to the gray-scale values of each channel. Only the two values of its highest brightness and lowest brightness are used to convert into a digital signal, as the control signal for segmented switching. Then, the three-channel signals of RGB are converted into the on and off states of 1, 2, and 3 segments of LEDs, thus being not affected by the stroboscopic effect of the pulse signal.

[0032] Further, the switching unit includes: a second capacitor, a third capacitor, a fourth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a MOS transistor, a triode, and a fourth light-emitting diode; the anode of the fourth light-emitting diode is connected to the VCC voltage terminal; the cathode of the fourth light-emitting diode is grounded after passing through the tenth resistor and the fourth capacitor in sequence; the cathode of the fourth light-emitting diode is connected to the LED control unit after passing through the tenth resistor; the base of the triode is connected to the LED control unit after passing through the ninth resistor; the base of the triode is grounded after passing through the third capacitor; the base of the triode is grounded after passing through the eighth resistor; the emitter of the triode is grounded; the collector of the triode is connected to the gate of the MOS transistor after passing through the seventh resistor; the gate of the MOS transistor is grounded after passing through the sixth resistor; the source of the MOS transistor is grounded; the drain of the MOS transistor is grounded after passing through the second capacitor; the drain of the MOS transistor is also connected to the lighting unit.

[0033] Further, the lighting unit includes: a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, a fourth resistor, and a fifth resistor;

[0034] The anode of the first light-emitting diode is connected to the VCC voltage terminal;

[0035] The cathode of the first light-emitting diode is connected to the anode of the second light-emitting diode after passing through the fourth resistor;

[0036] The cathode of the second light-emitting diode is connected to the anode of the third light-emitting diode after passing through the fifth resistor;

[0037] The cathode of the third light-emitting diode is connected to the switch unit.

[0038] In practical applications, the first pin, the second pin, and the third pin of the LED control chip can respectively serve as the outputs of 1 channel. The control signal is input into the switch module, and after removing the pulse signal through the Π-type filter composed of the third capacitor, the fourth capacitor, and the ninth resistor, it is given to the base of the triode. If it is a high level, the triode conducts, the VGS of the N-channel MOS transistor approaches 0V, the MOS transistor is cut off, and there is no current in the loop of the LED string composed of the first light-emitting diode, the second light-emitting diode, and the third light-emitting diode, and the LED string does not light up. On the contrary, when the first pin of the LED control chip outputs a low level, Q4 is cut off, the VGS voltage of the MOS transistor = 5V, the MOS transistor conducts, and the LED string has current passing through and lights up. U1 has three-channel outputs, so it can control the on and off of three segments. The LED control chip has a cascading function, and the data received by the first chip will be parsed and transmitted to the next chip. Here, the fifth pin of the LED control chip serves as the output of the data and can be output to the next level to achieve cascading, thereby realizing the data transmission and control of multiple segments.

[0039] In order to achieve brightness adjustment, the VCC voltage terminal connected to the anode of the first light-emitting diode in this application is a voltage source with adjustable low ripple voltage. The maximum value of this voltage is 24V. After current limiting through the fourth resistor and the fifth resistor, it provides the maximum reasonable working current for the LED string, thereby controlling the maximum power consumption, brightness, and temperature. By adjusting the voltage source through an external adjustable voltage component, the current of the LED string can be adjusted, thereby realizing adjustable brightness. Since the voltage source is smooth and has low ripple, it belongs to static drive, has no pulsating current, and has no stroboscopic effect.

[0040] Furthermore, an LED light source module includes: three lighting units, an LED control unit for correspondingly outputting control signals according to the received single-line return-to-zero code signals, and three switch units for controlling the on and off of the lighting units according to the control signals output by the LED control unit; the input ends of the three switch units are all connected to the output end of the LED control unit; the LED control unit further includes a second output end for connecting to the input end of an adjacent LED control unit; the outputs of the three switch units are respectively connected to the input ends of the three lighting units in one-to-one correspondence.

[0041] In practical applications, the output end of the LED control chip includes three channels of RGB. In this application, since color lighting is not required, the three channels of RGB can be respectively used to control three white LED strings, thereby realizing the superposition of lighting effects.

[0042] Example 2

[0043] Furthermore, as Figure 4 shown, an LED light source includes a plurality of the above-mentioned LED light source modules; the LED control units of the plurality of LED light source modules are connected end to end in sequence.

[0044] In practical applications, the LED control units are connected end to end in sequence, which means that when the sixth pin of the LED control chip is connected to the input signal, a control signal can be synchronously output at the fifth pin. Therefore, in actual use, only the sixth pin of the subsequent control chip needs to be connected to the fifth pin of the previous LED control chip in sequence to achieve the series connection of the chip group. The sequential connection of multiple LED light source modules can complete the control of multiple LED light source modules under the control of a single control signal.

[0045] In summary, the present application proposes an LED light source module and an LED light source. The LED light source module of the present application can avoid the stroboscopic problem of LEDs caused by pulse signals, enabling the light source of the present application to provide a lighting function for cameras. Moreover, multiple LED light source modules can be connected in a cascaded manner to achieve single-signal control of multiple lighting modules.

[0046] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0047] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An LED light source module, characterized in that: include: At least one lighting unit, an LED control unit for outputting a control signal corresponding to a received single-line return-to-zero code signal, and at least one switch unit for controlling the lighting unit to turn on and off according to the control signal output by the LED control unit; The input end of at least one switch unit is connected to the first output end of the LED control unit; The LED control unit further comprises a second output terminal for connecting to an input terminal of an adjacent LED control unit; The output end of at least one of the switch units is connected to the input end of at least one of the lighting units in a one-to-one correspondence.

2. The LED light source module according to claim 1, characterized in that: The LED control unit comprises: LED control chip, a first resistor, a second resistor, a third resistor and a first capacitor; The first pin of the LED control chip is connected to the switch unit; The second pin of the LED control chip is connected to the switch unit; The third pin of the LED control chip is connected to the switch unit; The fourth pin of the LED control chip is grounded; The LED control chip further includes: a fifth pin for connecting to a sixth pin of another LED control chip after passing through a third resistor; The sixth pin of the LED control chip is connected to the input end of the single-line return-to-zero code signal through the second resistor; The eighth pin of the LED control chip is connected to the VCC voltage terminal after passing through the first resistor; the eighth pin of the LED control chip is also connected to the ground after passing through the first resistor and the first capacitor in sequence.

3. The LED light source module according to claim 1, characterized in that: The switch unit includes: a second capacitor, a third capacitor, a fourth capacitor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a MOS tube, a triode and a fourth light emitting diode; The anode of the fourth light emitting diode is connected to the VCC voltage terminal; The cathode of the fourth light emitting diode is connected to the ground after passing through the tenth resistor and the fourth capacitor in sequence; the cathode of the fourth light emitting diode is connected to the LED control unit after passing through the tenth resistor; The base of the transistor is connected to the LED control unit after passing through a ninth resistor; The base of the transistor is grounded after passing through a third capacitor; The base of the transistor is grounded after passing through an eighth resistor; The emitter of the triode is grounded; The collector of the triode is connected to the gate of the MOS tube after passing through a seventh resistor; The gate of the MOS tube is grounded after passing through a sixth resistor; The source of the MOS tube is grounded; The drain of the MOS tube is grounded after passing through a second capacitor; The drain of the MOS tube is also connected to the lighting unit.

4. The LED light source module according to claim 1, characterized in that: The lighting unit comprises: a first light emitting diode, a second light emitting diode, a third light emitting diode, a fourth resistor and a fifth resistor; The anode of the first light emitting diode is connected to the VCC voltage terminal; The cathode of the first light emitting diode is connected to the anode of the second light emitting diode through a fourth resistor; The cathode of the second light emitting diode is connected to the anode of the third light emitting diode through a fifth resistor; The cathode of the third light emitting diode is connected to the switch unit.

5. The LED light source module according to claim 1, characterized in that: include: Three lighting units, an LED control unit for outputting a control signal corresponding to a received single-line return-to-zero code signal, and three switch units for controlling the lighting units to turn on and off according to the control signals output by the LED control unit; The input ends of the three switch units are all connected to the output end of the LED control unit; The LED control unit further comprises a second output terminal for connecting to an input terminal of an adjacent LED control unit; The outputs of the three switch units are connected to the input ends of the three lighting units in a one-to-one correspondence.

6. An LED light source, characterized in that: It comprises a plurality of LED light source modules as described in any one of claims 1 to 5; the LED control units of the plurality of LED light source modules are connected end to end in sequence.

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