High-voltage non-stroboscopic lamp band compatible with various silicon controlled rectifier dimming

Abstract

The utility model provides a high-voltage non-stroboscopic lamp strip compatible with dimming of various silicon controlled rectifiers. Comprising a rectifier bridge DB1, a linear constant current driving chip U1, a dimming discharge chip U2, a discharge resistor R7, a discharge resistor R8, a U2 sampling resistor R6, a first lamp string, a second lamp string, an electrolytic capacitor E1, an electrolytic capacitor E2, an electrolytic capacitor discharge resistor R4, an electrolytic capacitor discharge resistor R5, a U1 sampling resistor R1, a U1 sampling resistor R2, a U1 sampling resistor R3, a fly-wheel diode D1, a fly-wheel diode D2 and a fly-wheel diode D3, one end of the bleeder resistor R7 is connected with a pin 2 of the rectifier bridge DB1, and the other end of the bleeder resistor R7 is connected with one end of the bleeder resistor R8. The beneficial effects of the utility model are that the circuit can be compatible with silicon controlled dimmers of different specifications, and solves a problem that a lamp strip is liable to flicker under the condition of low power in a dimming process.

Description

Technical Field

[0001] This utility model relates to light strips, and more particularly to a high-voltage flicker-free light strip compatible with various silicon controlled rectifiers (SCRs) for dimming. Background Technology

[0002] LED strips are a type of lighting product that can be bent, cut, and spliced ​​at will, adapting to various complex installation environments.

[0003] Existing light strips mainly use silicon controlled rectifiers (SCRs) for dimming. However, because different specifications of SCRs have different operating currents, the light strips are prone to flickering when dimming at low power. Summary of the Invention

[0004] To address the problems in the existing technology, this utility model provides a high-voltage flicker-free light strip that is compatible with various silicon controlled rectifier (SCR) dimming methods.

[0005] This utility model provides a high-voltage flicker-free light strip compatible with various SCR dimming methods, including a rectifier bridge DB1, a linear constant current driver chip U1, a dimming discharge chip U2, discharge resistors R7 and R8, a U2 sampling resistor R6, a first light string, a second light string, electrolytic capacitors E1 and E2, electrolytic capacitor discharge resistors R4 and R5, U1 sampling resistors R1, R2, and R3, freewheeling diodes D1, D2, and D3. One end of the discharge resistor R7 is connected to pin 2 of the rectifier bridge DB1, and the other end of the discharge resistor R7 is connected to one end of the discharge resistor R8. The other end of the discharge resistor R8 is connected to... Pin 1 of the dimming discharge chip U2 is connected; one end of the sampling resistor R6 of U2 is connected to pin 2 of the dimming discharge chip U2; the other end of the sampling resistor R6 of U2 is connected to pin 3 of the dimming discharge chip U2; pin 3 of the dimming discharge chip U2 is connected to pin 8 of the linear constant current drive chip U1; pin 4 of the dimming discharge chip U2 is grounded; the positive terminal of the electrolytic capacitor E1 is connected to pin 2 of the rectifier bridge DB1; the negative terminal of the electrolytic capacitor E1 is connected to the anode of the freewheeling diode D3; one end of the electrolytic capacitor discharge resistor R4 is connected to pin 2 of the rectifier bridge DB1; the other end of the electrolytic capacitor discharge resistor R4 is connected to the anode of the freewheeling diode D3. The anode of the first light string is connected to pin 2 of the rectifier bridge DB1. The cathode of the first light string is connected to the anode of the freewheeling diode D3. The cathode of the freewheeling diode D3 is connected to pin 1 of the linear constant current driver chip U1. The anode of the freewheeling diode D2 is connected to the anode of the freewheeling diode D3. The cathode of the freewheeling diode D2 is connected to pin 2 of the linear constant current driver chip U1. The anode of the freewheeling diode D1 is connected to pin 2 of the rectifier bridge DB1. The cathode of the freewheeling diode D1 is connected to pin 3 of the linear constant current driver chip U1. The anode of the second light string is connected to pin 4 of the linear constant current driver chip U1. The cathode of the second light string is connected to the linear constant current driver chip U1. Pin 7 of the driver chip U1 is connected; one end of the sampling resistor R1 of U1 is connected to pin 5 of the linear constant current driver chip U1; the other end of the sampling resistor R1 is connected to pin 6 of the linear constant current driver chip U1; one end of the sampling resistor R2 of U1 is connected to pin 6 of the linear constant current driver chip U1; the other end of the sampling resistor R2 of U1 is connected to pin 4 of the linear constant current driver chip U1; one end of the sampling resistor R3 of U1 is connected to pin 8 of the linear constant current driver chip U1; the other end of the sampling resistor R3 of U1 is connected to pin 7 of the linear constant current driver chip U1; and one end of the electrolytic capacitor discharge resistor R5 is connected to pin 4 of the linear constant current driver chip U1.The other end of the discharge resistor R5 of the electrolytic capacitor is connected to pin 7 of the linear constant current drive chip U1. The positive terminal of the electrolytic capacitor E2 is connected to pin 4 of the linear constant current drive chip U1, and the negative terminal of the electrolytic capacitor E2 is connected to pin 7 of the linear constant current drive chip U1.

[0006] As a further improvement of this utility model, the high-voltage flicker-free light strip also includes a fuse resistor FR1 and a varistor RV1. One end of the fuse resistor FR1 is connected to the live wire L, and the other end of the fuse resistor FR1 is connected to pin 1 of the rectifier bridge DB1. One end of the varistor RV1 is connected to pin 1 of the rectifier bridge DB1, and the other end of the varistor RV1 is connected to pin 3 of the rectifier bridge DB1. Pin 3 of the rectifier bridge DB1 is connected to the neutral wire N, and pin 4 of the rectifier bridge DB1 is grounded.

[0007] The beneficial effects of this utility model are: the above solution is compatible with different specifications of thyristor dimmers and solves the problem of flickering that easily occurs during the dimming process of light strips under low power conditions. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other solutions can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a circuit diagram of a high-voltage flicker-free LED strip compatible with multiple thyristor dimming methods, according to this utility model. Detailed Implementation

[0010] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0011] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1 As shown, a high-voltage flicker-free LED strip compatible with multiple SCR dimming technologies includes a rectifier bridge DB1, a linear constant current drive chip U1, a dimming discharge chip U2, discharge resistors R7 and R8, a U2 sampling resistor R6, a first LED string, a second LED string, electrolytic capacitors E1 and E2, electrolytic capacitor discharge resistors R4 and R5, U1 sampling resistors R1, R2, and R3, and freewheeling diodes D1, D2, and D3.

[0015] Furthermore, one end of the bleeder resistor R7 is connected to pin 2 of the rectifier bridge DB1, the other end of the bleeder resistor R7 is connected to one end of the bleeder resistor R8, and the other end of the bleeder resistor R8 is connected to pin 1 of the dimming bleeder chip U2.

[0016] Furthermore, one end of the U2 sampling resistor R6 is connected to pin 2 of the dimming discharge chip U2, and the other end of the U2 sampling resistor R6 is connected to pin 3 of the dimming discharge chip U2.

[0017] Furthermore, pin 3 of the dimming discharge chip U2 is connected to pin 8 of the linear constant current drive chip U1.

[0018] Furthermore, pin 4 of the dimming discharge chip U2 is grounded.

[0019] Furthermore, the positive terminal of the electrolytic capacitor E1 is connected to pin 2 of the rectifier bridge DB1, and the negative terminal of the electrolytic capacitor E1 is connected to the anode of the freewheeling diode D3.

[0020] Furthermore, one end of the electrolytic capacitor discharge resistor R4 is connected to pin 2 of the rectifier bridge DB1, and the other end of the electrolytic capacitor discharge resistor R4 is connected to the anode of the freewheeling diode D3.

[0021] Furthermore, the anode of the first light string is connected to pin 2 of the rectifier bridge DB1, the cathode of the first light string is connected to the anode of the freewheeling diode D3, and the cathode of the freewheeling diode D3 is connected to pin 1 of the linear constant current drive chip U1.

[0022] Furthermore, the anode of the freewheeling diode D2 is connected to the anode of the freewheeling diode D3, and the cathode of the freewheeling diode D2 is connected to pin 2 of the linear constant current drive chip U1.

[0023] Furthermore, the anode of the freewheeling diode D1 is connected to pin 2 of the rectifier bridge DB1, and the cathode of the freewheeling diode D1 is connected to pin 3 of the linear constant current drive chip U1.

[0024] Furthermore, the anode of the second light string is connected to pin 4 of the linear constant current drive chip U1, and the cathode of the second light string is connected to pin 7 of the linear constant current drive chip U1.

[0025] Furthermore, one end of the sampling resistor R1 is connected to pin 5 of the linear constant current drive chip U1, and the other end of the sampling resistor R1 is connected to pin 6 of the linear constant current drive chip U1.

[0026] Furthermore, one end of the sampling resistor R2 of U1 is connected to pin 6 of the linear constant current drive chip U1, and the other end of the sampling resistor R2 of U1 is connected to pin 4 of the linear constant current drive chip U1.

[0027] Furthermore, one end of the sampling resistor R3 of U1 is connected to pin 8 of the linear constant current drive chip U1, and the other end of the sampling resistor R3 of U1 is connected to pin 7 of the linear constant current drive chip U1.

[0028] Furthermore, one end of the electrolytic capacitor discharge resistor R5 is connected to pin 4 of the linear constant current drive chip U1, and the other end of the electrolytic capacitor discharge resistor R5 is connected to pin 7 of the linear constant current drive chip U1.

[0029] Furthermore, the positive terminal of the electrolytic capacitor E2 is connected to pin 4 of the linear constant current drive chip U1, and the negative terminal of the electrolytic capacitor E2 is connected to pin 7 of the linear constant current drive chip U1.

[0030] Furthermore, the linear constant current driver chip U1 is a linear constant current driver chip designed for flicker-free SCR dimming. It supports SCR dimming, enabling uniform changes in LED brightness during the dimming process and meeting flicker certification requirements. The chip has an over-temperature regulation function, improving system reliability. Within half a cycle of the AC input voltage, when the input voltage is high enough to reach the series lamp voltage of the first and second LED strings, the first and second LED strings operate in series; when the input voltage is low enough not to reach the series lamp voltage of the first and second LED strings, the first and second LED strings operate in parallel, reducing the current ripple of the LEDs within the input voltage cycle. This also improves the luminous efficacy of the LED strip.

[0031] Furthermore, the first light string can be composed of LED beads LED1-LED8 connected in series.

[0032] Furthermore, the second string of lights can be composed of LED beads LED9-LED16 connected in series.

[0033] Furthermore, both electrolytic capacitors E1 and E2 are filter electrolytic capacitors, and their working principle is based on the charging and discharging characteristics of capacitors. When the input voltage is higher than the capacitor voltage, the capacitor charges; when the input voltage is lower than the capacitor voltage, the capacitor discharges. In this way, the capacitor can smooth voltage fluctuations, stabilize the normal operation of the LED, and achieve the function of eliminating flicker.

[0034] Furthermore, the high-voltage flicker-free light strip also includes a fuse resistor FR1 and a varistor RV1. One end of the fuse resistor FR1 is connected to the live wire L, and the other end of the fuse resistor FR1 is connected to pin 1 of the rectifier bridge DB1. One end of the varistor RV1 is connected to pin 1 of the rectifier bridge DB1, and the other end of the varistor RV1 is connected to pin 3 of the rectifier bridge DB1. Pin 3 of the rectifier bridge DB1 is connected to the neutral wire N, and pin 4 of the rectifier bridge DB1 is grounded.

[0035] Furthermore, the function of the fuse resistor FR1 is: when the circuit experiences an overload or short circuit, causing the current to exceed the rated value of the fuse resistor, it will rapidly heat up and melt within a short time, thereby disconnecting the circuit and preventing damage to other components.

[0036] Further, the main function of the varistor RV1 is to absorb overvoltage in the circuit and prevent other electronic components from being damaged due to overvoltage. When the voltage in the circuit exceeds the threshold of the varistor, it will conduct rapidly and guide the excess current to the ground, thus protecting other components in the circuit.

[0037] A high-voltage non-flickering light strip compatible with multiple thyristor dimmers provided by the present utility model adds a dimming discharge chip U2. During the process of dimming the high-voltage light strip at low power, when the current flowing through the dimmer cannot make the thyristor dimmer work properly, this part of the current can return to GND through the dimming discharge chip U2, so that the LED will not light up and there will be no flickering of the LED caused by the low current of the thyristor dimmer. It should be noted that in practical applications, the discharge current can be set at about 10 mA to ensure that the current flowing through the thyristor dimmer during the entire dimming process of the LED light strip can ensure the normal operation of the thyristor and the non-flickering light strip, making the dimming compatible with more dimmers, improving the user's satisfaction, and at the same time improving the dimming performance of the product.

[0038] For a high-voltage non-flickering light strip compatible with multiple thyristor dimmers provided by the present utility model, the voltage drops of the first lamp string and the second lamp string need to be set to be equal, and the total voltage drop VLED total of the LED lamp string < Vin - VOUT_min, where Vin is the input voltage and VOUT_min is the minimum operating voltage of the chip port.

[0039] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A high-voltage flicker-free LED strip compatible with multiple SCR dimming methods, characterized in that: The system includes a rectifier bridge DB1, a linear constant current driver chip U1, a dimming discharge chip U2, discharge resistors R7 and R8, a U2 sampling resistor R6, a first LED string, a second LED string, electrolytic capacitors E1 and E2, electrolytic capacitor discharge resistors R4 and R5, U1 sampling resistors R1, R2, and R3, freewheeling diodes D1, D2, and D3. One end of the discharge resistor R7 is connected to pin 2 of the rectifier bridge DB1, and the other end of the discharge resistor R7 is connected to one end of the discharge resistor R8. The other end of the discharge resistor R8 is connected to pin 1 of the dimming discharge chip U2. One end of the U2 sampling resistor R6... The first light string is connected to pin 2 of the dimming discharge chip U2, the other end of the sampling resistor R6 of U2 is connected to pin 3 of the dimming discharge chip U2, pin 3 of the dimming discharge chip U2 is connected to pin 8 of the linear constant current drive chip U1, pin 4 of the dimming discharge chip U2 is grounded, the positive terminal of the electrolytic capacitor E1 is connected to pin 2 of the rectifier bridge DB1, the negative terminal of the electrolytic capacitor E1 is connected to the anode of the freewheeling diode D3, one end of the electrolytic capacitor discharge resistor R4 is connected to pin 2 of the rectifier bridge DB1, the other end of the electrolytic capacitor discharge resistor R4 is connected to the anode of the freewheeling diode D3, the anode of the first light string is connected to pin 2 of the rectifier bridge DB1, and the first light string... The cathode of the freewheeling diode D3 is connected to the anode of the freewheeling diode D3, and the cathode of the freewheeling diode D3 is connected to pin 1 of the linear constant current driver chip U1. The anode of the freewheeling diode D2 is connected to the anode of the freewheeling diode D3, and the cathode of the freewheeling diode D2 is connected to pin 2 of the linear constant current driver chip U1. The anode of the freewheeling diode D1 is connected to pin 2 of the rectifier bridge DB1, and the cathode of the freewheeling diode D1 is connected to pin 3 of the linear constant current driver chip U1. The anode of the second light string is connected to pin 4 of the linear constant current driver chip U1, and the cathode of the second light string is connected to pin 7 of the linear constant current driver chip U1. One end of the sampling resistor R1 of U1 is connected to the linear constant current driver chip U1. Pin 5 of the linear constant current drive chip U1 is connected to the linear constant current drive chip U1. The other end of the sampling resistor R1 is connected to pin 6 of the linear constant current drive chip U1. One end of the sampling resistor R2 is connected to pin 6 of the linear constant current drive chip U1, and the other end is connected to pin 4 of the linear constant current drive chip U1. One end of the sampling resistor R3 is connected to pin 8 of the linear constant current drive chip U1, and the other end is connected to pin 7 of the linear constant current drive chip U1. One end of the electrolytic capacitor discharge resistor R5 is connected to pin 4 of the linear constant current drive chip U1, and the other end is connected to pin 7 of the linear constant current drive chip U1.The positive terminal of the electrolytic capacitor E2 is connected to pin 4 of the linear constant current drive chip U1, and the negative terminal of the electrolytic capacitor E2 is connected to pin 7 of the linear constant current drive chip U1.

2. The high-voltage flicker-free LED strip compatible with multiple thyristor dimming methods as described in claim 1, characterized in that: The high-voltage flicker-free light strip also includes a fuse resistor FR1 and a varistor RV1. One end of the fuse resistor FR1 is connected to the live wire L, and the other end of the fuse resistor FR1 is connected to pin 1 of the rectifier bridge DB1. One end of the varistor RV1 is connected to pin 1 of the rectifier bridge DB1, and the other end of the varistor RV1 is connected to pin 3 of the rectifier bridge DB1. Pin 3 of the rectifier bridge DB1 is connected to the neutral wire N, and pin 4 of the rectifier bridge DB1 is grounded.

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