Multi-path parallel LED lamp string single-channel CD-ROM drive circuit

Abstract

The utility model discloses a multi-path parallel connection level LED lamp string single-channel CD-ROM drive circuit, after an LED lamp string drive circuit is powered on, an adjusting process is carried out before a drive IC reaches a stable state, the switching of a switch in the drive IC can form jitter clutter on the voltage of a lamp string to influence the illumination uniformity, and meanwhile, the switching current fluctuation can influence the overall brightness of the lamp string, so that the LED lamp string can be driven by the LED lamp string drive circuit. The larger the shaking range is, the lower the overall brightness of the lamp string is. The voltage balance circuit can reduce the damage to the lamp string and the influence on the service life of the lamp string at the starting moment of the driving IC; the current equalization circuit can reduce the current fluctuation and maintain the illumination intensity of the lamp string under the condition that the effective value of the current is limited. Wherein the lamp string is protected by the voltage balance circuit to avoid high voltage or potential impact damage, and the light modulation uniformizing circuit 1 and the light modulation uniformizing circuit 2 can filter voltage clutters on the LED lamp string, so that the light is more uniform; the current balancing circuit minimizes the current jitter, and enhances and maintains the strong illuminance.

Description

Technical Field

[0001] The utility model relates to the field of LED light strings, in particular to a single-channel optical drive circuit for multi-channel parallel-level LED light strings. Background Art

[0002] Fill light technology has a wide range of application scenarios in many fields, such as industrial cameras, film and television shooting, beauty live broadcast, selfie photography, etc. In civilian use, such as beauty live broadcast rooms in a large area, it is necessary to have sufficient brightness and uniform light to make the picture not dark and there will be no deviation when testing colors;

[0003] A typical example in industry is that an industrial camera used for navigation and identification of ground QR codes is located in a car body. Since the car body is closed and the interior is dark, it is necessary to add a supplementary light source in the dark environment so that the industrial camera can recognize the QR code. For clear identification, the light source needs to be bright enough and have a wide range, which means that multiple LED supplementary light strings are needed. Multiple LED supplementary light strings mean that multi-channel multi-channel driver ICs are required, which increases development costs. Alternatively, connecting multiple LED light strings in parallel and directly connecting them to the driver IC will further increase the brightness changes of the light strings due to the consistency problem of the lamp beads. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a single-channel optical drive circuit for a multi-channel parallel-stage LED light string.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a multi-channel parallel-stage LED light string single-channel optical drive circuit, including a power supply VCC, characterized in that: one side of the power supply VCC is connected to a voltage balancing circuit and a current balancing circuit, one end of the voltage balancing circuit is connected to a light adjustment uniformity 1 circuit, one end of the current balancing circuit is connected to a driving IC, the other end of the current balancing circuit is connected to a light adjustment uniformity 2 circuit, and an LED light string is arranged between the light adjustment uniformity 1 circuit and the light adjustment uniformity 2 circuit.

[0006] As a further description of the above technical solution:

[0007] The uniformity circuit is composed of resistance, capacitance, inductance, diode, LED light string and driver IC, among which the series and parallel resistors constitute the voltage balance circuit;

[0008] The capacitors constitute a light adjustment uniformity circuit 1 and a light adjustment uniformity circuit 2;

[0009] The inductor, resistor and diode form a current balancing circuit; the light string is protected by the voltage balancing circuit to avoid high voltage or potential impact damage, the light adjustment uniformity 1 circuit and the light adjustment uniformity 2 circuit can filter out the voltage noise on the LED light string to make the light more uniform; the current balancing circuit minimizes the current jitter and enhances the maintenance of strong light illumination.

[0010] As a further description of the above technical solution:

[0011] Optical drive circuit: After the LED light string driving circuit is powered on, there will be an adjustment process before the driver IC reaches a stable state, and the switching of the internal switch of the driver IC will cause jitter noise to the light string voltage, affecting the uniformity of light. At the same time, the switching current fluctuation will affect the overall brightness of the light string. The larger the jitter range, the lower the overall brightness of the light string.

[0012] The voltage balancing circuit can reduce the damage and lifespan of the light string caused by the driver IC at the moment of startup; the light modulation circuit can maintain the voltage stability of the light string and reduce voltage jitter to avoid slight changes in the brightness of the light string; the current balancing circuit can reduce current fluctuations and maintain the light intensity of the light string under the condition of limiting the effective value of the current.

[0013] As a further description of the above technical solution:

[0014] Resistors R1 to R4 form a voltage balancing circuit, capacitors C1 and C2 form a light modulation circuit, and inductors L1, DP and RD form a current balancing circuit.

[0015] The utility model has the following beneficial effects:

[0016] The utility model is composed of a voltage balancing circuit, a light adjustment circuit, an LED light string, and a current balancing circuit. After the LED light string driving circuit is powered on, there will be an adjustment process before the driver IC reaches a stable state, and the switching of the internal switch of the driver IC will cause jitter noise to the light string voltage, affecting the uniformity of the light. At the same time, the switching current fluctuation will affect the overall brightness of the light string. The larger the jitter range, the lower the overall brightness of the light string. The voltage balancing circuit can reduce the damage and life impact of the driver IC on the light string at the moment of starting; the light adjustment circuit can maintain the voltage stability of the light string and reduce voltage jitter to avoid slight changes in light and dark of the light string; the current balancing circuit can reduce the current fluctuation under the condition of limiting the effective value of the current to maintain the light intensity of the light string. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a principle block diagram of a single-channel optical drive circuit for a multi-channel parallel-connected LED light string proposed by the utility model;

[0018] Figure 2 The utility model provides a circuit schematic diagram of a single-channel optical drive circuit for a multi-channel parallel-stage LED light string.

[0019] Legend:

[0020] 1. Power supply VCC; 2. Voltage balancing circuit; 3. Light adjustment uniformity 1 circuit; 4. Current balancing circuit; 5. Light adjustment uniformity 2 circuit; 6. Driver IC; 7. LED light string. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model; the terms "first", "second" and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] Reference Figure 1-2 The utility model provides an embodiment: a multi-channel parallel-stage LED light string single-channel optical drive circuit, including a power supply VCC1, one side of the power supply VCC1 is connected to a voltage balancing circuit 2 and a current balancing circuit 4, one end of the voltage balancing circuit 2 is connected to a light adjustment uniformity 1 circuit 3, one end of the current balancing circuit 4 is connected to a driver IC6, the other end of the current balancing circuit 4 is connected to a light adjustment uniformity 2 circuit 5, and an LED light string 7 is arranged between the light adjustment uniformity 1 circuit 3 and the light adjustment uniformity 2 circuit 5.

[0024] Specifically, a multi-channel parallel LED single-channel optical drive circuit is composed of a voltage balancing circuit, a light adjustment uniformity circuit, and a current balancing circuit in sequence. One end of the voltage balancing circuit is connected to a power supply, and the other end is connected to one end of the light adjustment uniformity 1 circuit and one end of the multi-channel parallel LED light string circuit; the other end of the multi-channel parallel LED light string is connected to one end of the light adjustment uniformity 2 circuit and one end of the current balancing circuit; the other ends of the light adjustment uniformity 1 and light adjustment uniformity 2 circuits are both grounded; the other two ends of the current balancing circuit are respectively connected to the power supply and the driver IC.

[0025] In particular, when the power is just turned on, the current passes through the voltage balance circuit->light adjustment circuit->parallel LED light string->current balance circuit. At the moment when the power-on IC starts to adjust, the voltage balance circuit can protect the subsequent LED light string from being damaged by power surges and can cope with the impact of a certain fluctuation range of the power supply on the light string.

[0026] When the LED light string is working normally, the voltage will fluctuate due to the continuous switching of the driver IC, resulting in a slight flicker in the light string. The existence of the light adjustment uniformity circuit 1 C1 and the light adjustment uniformity circuit 2 C2 greatly reduces the voltage fluctuation on the light string, and even makes the voltage of the light string stable with almost no jitter, and even the light string has no slight change in brightness.

[0027] The current balancing circuit can make the current balanced without obvious jitter by selecting appropriate inductance. Under the condition of keeping the effective value of the limiting current unchanged, the light intensity of the light string can be increased; D P and R D The path can indirectly adjust the balancing effect of L1 in the circuit and provide overvoltage protection for the connection.

[0028] In the utility model, the uniformity circuit is composed of a resistor, a capacitor, a diode, an LED light string 7 and a driver IC 6, wherein the series-parallel resistors constitute a voltage balancing circuit 2;

[0029] The capacitors constitute a light adjustment uniformity circuit 1 3 and a light adjustment uniformity circuit 2 5;

[0030] The inductor, the resistor and the diode constitute the current balancing circuit 4; the light string is protected by the voltage balancing circuit to avoid high voltage or potential impact damage, the light adjustment uniformity circuit 1 and the light adjustment uniformity circuit 2 can filter out the voltage noise on the LED light string to make the light more uniform; the current balancing circuit minimizes the current jitter and enhances the maintenance of strong light illumination.

[0031] Furthermore, the optical drive circuit: after the LED light string 7 driving circuit is powered on, there will be an adjustment process before the driver IC 6 reaches a stable state, and the switching of the internal switch of the driver IC will cause jitter clutter on the light string voltage, affecting the uniformity of light illumination. At the same time, the switching current fluctuation will affect the overall brightness of the light string. The larger the jitter range, the lower the light string;

[0032] The voltage balancing circuit 2 can reduce the damage and life impact of the light string at the moment of driver IC startup; the light modulation circuit can maintain the voltage stability of the light string and reduce voltage jitter to avoid slight changes in light and dark of the light string; the current balancing circuit can reduce current fluctuations and maintain the light intensity of the light string when the effective value of the current is limited.

[0033] Furthermore, the resistors R1 to R4 constitute a voltage balancing circuit, the capacitors C1 and C2 respectively constitute a light modulation circuit, and the inductors L1, DP and RD constitute a current balancing circuit.

[0034] The principle block diagram of the utility model is as follows Figure 1 As shown in the figure, a low-cost single-channel driving multi-stage parallel LED light string to enhance the illumination and uniformity circuit design is connected between the power supply and the driver IC, which is composed of a voltage balancing circuit, a light adjustment uniformity circuit, a current balancing circuit, and a driver IC in sequence. Through this driving circuit, the multi-channel parallel LED light string can work stably and enhance the illumination and uniformity.

[0035] The circuit schematic diagram of the utility model is as follows Figure 2 As shown, the first ends of R1 and R3 are connected to the power supply VCC, the second end of R1 is connected to the first end of R2, the second end of R3 is connected to the first end of R4, the second ends of R2 and R4 are connected to the first end of C1, the second end of C1 is connected to the ground, the second ends of R2 and R4 are connected to the first end of the LED light string, the second end of the LED light string is connected to the first end of C2, the second end of C2 is connected to the ground, the second end of the LED light string is connected to the first end of L1, the second end of L1 is connected to the driver IC pin, and the third end of L1 is connected to D P The first end of the termination, D P The second end and R D The first end of the termination, R D The second end is connected to the power supply VCC.

[0036] After power is turned on, the voltage balance circuit of R1~R4 is used to protect the circuit from impact, and then the voltage on the LED light string is filtered out by the light adjustment circuit 1 C1, and then the light adjustment circuit 2 C2 is used to further filter out the noise interference after passing through the LED light string, and reaches L1 for current balance, controlling the current fluctuation within an acceptable and reasonable range. At the same time, D P ->R D The path clamps the high voltage that may be generated by L1 to within the maximum limit of the driver IC to avoid damage to the driver IC, and R D It is worth choosing to adjust the balancing effect of L1 to a certain extent.

[0037] In order to achieve the best effect of current balancing and light modulation, it is necessary to select the resistance, capacitance and inductance parameters of the light modulation circuit, voltage balancing circuit and current balancing circuit.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-channel optical drive circuit for a multi-channel cascade LED light string, comprising a power supply VCC (1), characterized in that: One side of the power supply VCC (1) is connected to a voltage balancing circuit (2) and a current balancing circuit (4); one end of the voltage balancing circuit (2) is connected to a light adjustment uniformity 1 circuit (3); one end of the current balancing circuit (4) is connected to a driver IC (6); the other end of the current balancing circuit (4) is connected to a light adjustment uniformity 2 circuit (5); and an LED light string (7) is arranged between the light adjustment uniformity 1 circuit (3) and the light adjustment uniformity 2 circuit (5).

2. A multi-channel cascade LED light string single-channel optical drive circuit according to claim 1, characterized in that: The uniformity circuit is composed of a resistor, a capacitor, an inductor, a diode, an LED light string (7) and a driver IC (6), wherein the series-parallel resistors form a voltage balancing circuit (2); The capacitors form a light adjustment uniformity circuit 1 (3) and a light adjustment uniformity circuit 2 (5); The inductor, the resistor and the diode constitute a current balancing circuit (4); the light string is protected by the voltage balancing circuit to avoid high voltage or potential impact damage, the light adjustment uniformity 1 circuit and the light adjustment uniformity 2 circuit can filter out voltage noise on the LED light string to make the light more uniform; the current balancing circuit minimizes current jitter and enhances the maintenance of strong light illumination.

3. The single-channel optical drive circuit of a multi-channel cascaded LED light string according to claim 1, characterized in that: Optical drive circuit: After the LED light string (7) driving circuit is powered on, there will be an adjustment process before the driver IC (6) reaches a stable state, and the switching of the internal switch of the driver IC will cause jitter noise to the light string voltage, affecting the uniformity of light illumination. At the same time, the switching current fluctuation will affect the overall brightness of the light string. The larger the jitter range, the lower the overall brightness of the light string. The voltage balancing circuit (2) can reduce the damage and lifespan of the light string caused by the driver IC starting up; the light modulation circuit can maintain the voltage stability of the light string and reduce voltage jitter, thereby avoiding slight changes in the brightness of the light string; the current balancing circuit can reduce the current fluctuation under the condition of limiting the effective value of the current, thereby maintaining the light intensity of the light string.

4. The single-channel optical drive circuit of a multi-channel cascaded LED light string according to claim 2, characterized in that: Resistors R1 to R4 form a voltage balancing circuit, capacitors C1 and C2 form a light modulation circuit, and inductors L1, DP and RD form a current balancing circuit.

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