LED light bar capable of adjusting color temperature and color adjusting driving circuit

Abstract

The utility model discloses a color-temperature-adjustable LED light bar and a color-adjusting driving circuit, the color-temperature-adjustable LED light bar comprises a substrate, a first LED light-emitting circuit and a second LED light-emitting circuit, the substrate is provided with a high-color-temperature light-emitting area and a low-color-temperature light-emitting area in sequence along the length direction of the substrate, the two ends of the substrate are respectively provided with an electrode, and the first LED light-emitting circuit and the second LED light-emitting circuit are respectively connected with the electrodes. The two electrodes are called a first electrode and a second electrode respectively, the positive electrode of the first LED light-emitting circuit and the negative electrode of the second LED light-emitting circuit are both connected with the first electrode, and the negative electrode of the first LED light-emitting circuit and the positive electrode of the second LED light-emitting circuit are both connected with the second electrode; the LED filament lamp has the advantages that the dimming function can be achieved only by arranging the two electrodes, the machining difficulty is low, the electrodes can be prevented from falling off, and the cost can be greatly reduced when the LED filament lamp is used for the LED filament lamp with the adjustable color temperature.

Description

Technical Field

[0001] The utility model relates to an LED light bar, in particular to an LED light bar with adjustable color temperature and a color adjustment driving circuit thereof. Background Art

[0002] The light-emitting component of the LED filament lamp usually adopts an LED light bar, which is a strip-shaped structure. Traditional LED light bars usually include a substrate wrapped with fluorescent glue, an LED light-emitting circuit composed of a number of LED wafers arranged in a linear shape and fixed on one surface of the substrate wrapped with fluorescent glue, and two electrodes, and the two electrodes are respectively fixed at the two ends of the substrate wrapped with fluorescent glue. In the LED light-emitting circuit, a number of LED wafers are connected together by wires in a preset series-parallel manner. The LED light-emitting circuit has a positive electrode and a negative electrode. The positive electrode of the LED light-emitting circuit is connected to an electrode, which is the positive electrode of the LED light bar, and the negative electrode of the LED light-emitting circuit is connected to another electrode, which is the negative electrode of the LED light bar. When a direct current is connected between the positive and negative electrodes of the LED light bar, the LED light-emitting circuit emits light. Among them, the spectrum of light emitted by the LED light-emitting circuit after passing through the wrapped fluorescent glue corresponds to the type of fluorescent glue. If the spectral wavelength of the generated light is longer, the generated light is low color temperature light, and the LED light strip emits low color temperature light. Conversely, if the spectral wavelength of the generated light is shorter, the generated light is high color temperature light, and the LED light strip emits high color temperature light.

[0003] In recent years, LED filament lamps with adjustable color temperature have appeared. In order to reduce the cost and improve the uniformity of light emission, LED filament lamps with adjustable color temperature use an LED light bar that can emit two color temperature lights separately as its light-emitting component. This LED light bar is characterized in that it has two electrodes at one end and either two electrodes or a common electrode at the other end. Along its length, one side of the LED light bar is set as a high color temperature light-emitting area through fluorescent glue, and the other side is set as a low color temperature light-emitting area through fluorescent glue. An LED light-emitting circuit is respectively provided in the high color temperature light-emitting area and the low color temperature light-emitting area. Figure 1 and Figure 2As shown, if the LED light bar adopts a common electrode, the common electrode serves as the positive electrode of the LED light bar, and the other two electrodes serve as the two negative electrodes of the LED light bar. The positive electrodes of the two LED light-emitting circuits are connected to the common electrode, and the negative electrodes of the two LED light-emitting circuits are connected to the two negative electrodes of the LED light bar. The two LED light-emitting circuits have independent negative electrodes and a common positive electrode. If both ends of the LED light bar have two electrodes, the two electrodes at one end of the LED light bar serve as its two positive electrodes, and the two electrodes at the other end serve as its two negative electrodes, and its two positive electrodes correspond to its two negative electrodes one by one. The negative electrodes of the two LED light-emitting circuits are connected to the two negative electrodes of the LED light bar, and the positive electrodes of the two LED light-emitting circuits are connected to the two positive electrodes of the LED light bar. When current is connected between a corresponding positive electrode and a negative electrode of the LED light bar, the LED light-emitting circuit connected to the positive electrode and the negative electrode emits light, and the LED light bar emits light of the corresponding color temperature. At the same time, the two LED light-emitting circuits can emit light independently or simultaneously, that is, the LED light strip can generate light of one color temperature independently or generate light of two color temperatures simultaneously.

[0004] However, although the above-mentioned LED light strip can reduce the cost of the LED filament lamp with adjustable color temperature to a certain extent and improve its light uniformity, this kind of LED light strip has two electrodes at least at one end, and due to size limitations, the two electrodes are very close to each other, making it difficult to process and it is easy for the electrodes to fall off.

[0005] In view of this, improving the design technology of LED light strips and reducing their processing difficulty is of great significance for reducing the cost space of LED filament lamps with adjustable color temperature. Summary of the invention

[0006] One of the technical problems to be solved by the utility model is to provide an LED light bar with adjustable color temperature, which has low processing difficulty, can avoid electrode shedding, and can greatly reduce the cost when used for LED filament lamps with adjustable color temperature.

[0007] The technical solution adopted by the utility model to solve one of the above-mentioned technical problems is: an LED light strip with adjustable color temperature, comprising a substrate and two LED light-emitting circuits, wherein the substrate is sequentially provided with a high color temperature light-emitting area and a low color temperature light-emitting area along its length direction, wherein the high color temperature light-emitting area and the low color temperature light-emitting area are respectively realized by wrapping corresponding fluorescent glue on the substrate, and the two LED light-emitting circuits both have a positive electrode and a negative electrode, and the two LED light-emitting circuits are respectively referred to as a first LED light-emitting circuit and a second LED light-emitting circuit, wherein the first LED light-emitting circuit is arranged in the high color temperature light-emitting area, and the second LED light-emitting circuit is arranged in the low color temperature light-emitting area, and an electrode is respectively provided at both ends of the substrate, and the two electrodes are respectively referred to as a first electrode and a second electrode, wherein the positive electrode of the first LED light-emitting circuit and the negative electrode of the second LED light-emitting circuit are both connected to the first electrode, and the negative electrode of the first LED light-emitting circuit and the positive electrode of the second LED light-emitting circuit are both connected to the second electrode.

[0008] Compared with the prior art, the advantage of the LED light bar with adjustable color temperature of the present invention is that an electrode is respectively provided at both ends of the substrate, and the two electrodes are respectively called the first electrode and the second electrode. The positive electrode of the first LED light-emitting circuit and the negative electrode of the second LED light-emitting circuit are both connected to the first electrode, and the negative electrode of the first LED light-emitting circuit and the positive electrode of the second LED light-emitting circuit are both connected to the second electrode. When the current direction is from the first electrode of the LED light bar with adjustable color temperature to its second electrode, the first LED light-emitting circuit emits light, and at this time, the LED light bar with adjustable color temperature emits high color temperature light. When the current direction is from the second electrode of the LED light bar with adjustable color temperature to its first electrode, the second LED light-emitting circuit emits light, and at this time, the LED light bar with adjustable color temperature emits low color temperature light. Therefore, the LED light bar with adjustable color temperature of the present invention only needs to set two electrodes to realize the dimming function, the processing difficulty is relatively low, and the electrode can be prevented from falling off. When used for LED filament lamps with adjustable color temperature, its cost can be greatly reduced.

[0009] The second technical problem to be solved by the present invention is to provide a color adjustment driving circuit. When the two ends of the LED light bar with adjustable color temperature have only one electrode, the color adjustment driving circuit can also drive the LED light bar with adjustable color temperature to emit light of different color temperatures, thereby reducing its processing difficulty and preventing its electrode from falling off when used to drive the LED light bar with adjustable color temperature.

[0010] The technical solution adopted by the utility model to solve the second technical problem mentioned above is: a color adjustment drive circuit, used to drive the LED light bar with adjustable color temperature, having a positive input terminal, a negative input terminal, a first output terminal, a second output terminal, a control terminal, a positive electrode and a negative electrode, the positive input terminal and the negative input terminal of the color adjustment drive circuit are used to connect the constant current output by the external constant current output power supply, the first output terminal of the color adjustment drive circuit is used to be connected to the first electrode of the LED light bar with adjustable color temperature, the second output terminal of the color adjustment drive circuit is used to be connected to the The second electrode of the LED light strip with adjustable color temperature is connected. When the power supply voltage is connected between the positive and negative poles of the color adjustment drive circuit, the control end is connected to an electrical signal, and a constant current is connected between the positive input end and the negative input end, the current output between the first output end and the second output end is equal to the current connected between the positive input end and the negative input end, but the direction of the current output between the first output end and the second output end changes periodically, and the time ratio of the current output between the first output end and the second output end in the positive and negative directions corresponds to the electrical signal connected to the control end.

[0011] The color adjustment driving circuit includes a first integrated circuit of model BP5936D, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor and a second transistor. The first capacitor is an electrolytic capacitor. One end of the first resistor, one end of the third resistor, the emitter of the first transistor, the emitter of the second transistor, and the VH pin of the first integrated circuit are connected to the positive electrode of the first capacitor, and the connection end thereof is the positive input end of the color adjustment driving circuit. The VS pin of the first integrated circuit is connected to the negative electrode of the first capacitor, and the connection end thereof is the negative input end of the color adjustment driving circuit. The other end of the first resistor, one end of the second resistor, one end of the second capacitor are connected to the base of the first transistor. The other end of the third resistor, one end of the fourth resistor, One end of the third capacitor is connected to the base of the second transistor, the collector of the first transistor, the other end of the fourth resistor, and the other end of the third capacitor are connected to the D1 pin of the first integrated circuit, and the connection end thereof is the first output end of the color adjustment drive circuit, the collector of the second transistor, the other end of the second resistor, and the other end of the second capacitor are connected to the D2 pin of the first integrated circuit, and the connection end thereof is the second output end of the color adjustment drive circuit, one end of the fifth resistor is connected to the Rdelay pin of the first integrated circuit, the other end of the fifth resistor is connected to the GND pin of the first integrated circuit, and the connection end thereof is the negative electrode of the color adjustment drive circuit, the VCC pin of the first integrated circuit is the positive electrode of the color adjustment drive circuit, and the PWM pin of the first integrated circuit is the control end of the color adjustment drive circuit.

[0012] Compared with the prior art, the color adjustment driving circuit of the utility model has the advantages that, since the power supply voltage is connected between the positive and negative electrodes of the color adjustment driving circuit, when the control terminal is connected to an electrical signal, when a constant current is connected between the positive input terminal and the negative input terminal, the current output between the first output terminal and the second output terminal is equal to the current connected between the positive input terminal and the negative input terminal, but the direction of the current output between the first output terminal and the second output terminal changes periodically, and the time ratio of the current output between the first output terminal and the second output terminal in the positive and negative directions corresponds to the electrical signal connected to the control terminal, and the color adjustment driving circuit is connected to the first output terminal of the color adjustment driving circuit. When the first electrode of the LED light strip with adjustable color temperature and the second output end thereof are connected to the second electrode of the LED light strip with adjustable color temperature, when different electrical signals are connected to the control end of the color adjustment driving circuit, the ratio of the average light intensity of the LED light strip with adjustable color temperature when emitting light at high color temperature and the average light intensity when emitting light at low color temperature and the ratio of their luminous time are consistent, thereby presenting different mixed light color temperatures. Therefore, when the color adjustment driving circuit of the utility model has only one electrode at both ends of the LED light strip with adjustable color temperature, it can also drive the LED light strip with adjustable color temperature to emit light of different color temperatures, thereby reducing its processing difficulty and preventing its electrodes from falling off when used to drive the LED light strip with adjustable color temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The circuit diagram of the existing LED light strip with adjustable color temperature;

[0014] Figure 2 It is a structural schematic diagram of an existing LED light bar with adjustable color temperature;

[0015] Figure 3 The circuit diagram of the LED light bar with adjustable color temperature of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the LED light bar with adjustable color temperature of the utility model;

[0017] Figure 5 This is a connection block diagram of the color adjustment driving circuit of the utility model when it is used for an LED light bar with adjustable color temperature;

[0018] Figure 6 The utility model is a circuit diagram of a color adjustment driving circuit. DETAILED DESCRIPTION

[0019] The utility model discloses an LED light bar with adjustable color temperature. The LED light bar with adjustable color temperature of the utility model is further described in detail below in conjunction with the embodiments of the drawings.

[0020] Embodiment 1: Figure 3 and Figure 4As shown, an LED light strip with adjustable color temperature includes a substrate and two LED light-emitting circuits. The substrate is provided with a high color temperature light-emitting area and a low color temperature light-emitting area in sequence along its length direction. The high color temperature light-emitting area and the low color temperature light-emitting area are respectively realized by wrapping corresponding fluorescent glue on the substrate. The two LED light-emitting circuits have a positive electrode and a negative electrode. The two LED light-emitting circuits are respectively referred to as a first LED light-emitting circuit LED1 and a second LED light-emitting circuit LED2. The first LED light-emitting circuit LED1 is arranged in the high color temperature light-emitting area, and the second LED light-emitting circuit LED2 is arranged in the low color temperature light-emitting area. An electrode is respectively provided at both ends of the substrate. The two electrodes are respectively referred to as a first electrode and a second electrode. The positive electrode of the first LED light-emitting circuit LED1 and the negative electrode of the second LED light-emitting circuit LED2 are both connected to the first electrode, and the negative electrode of the first LED light-emitting circuit LED1 and the positive electrode of the second LED light-emitting circuit LED2 are both connected to the second electrode.

[0021] In the LED light strip with adjustable color temperature of the present embodiment, when the current direction is from the first electrode of the LED light strip with adjustable color temperature to its second electrode, the first LED light-emitting circuit LED1 emits light, and at this time the LED light strip with adjustable color temperature emits high color temperature light; when the current direction is from the second electrode of the LED light strip with adjustable color temperature to its first electrode, the second LED light-emitting circuit LED2 emits light, and at this time the LED light strip with adjustable color temperature emits low color temperature light.

[0022] The color temperature adjustable LED light bar of the present embodiment can also form an LED dimming module by series-parallel connection. When two color temperature adjustable LED light bars of the present utility model are connected in series to form an LED dimming module, the first electrode of one of the color temperature adjustable LED light bars is the first electrode of the LED dimming module, and its second electrode is connected to the first electrode of the other color temperature adjustable LED light bar, and the second electrode of the other color temperature adjustable LED light bar is the second electrode of the LED dimming module. When two color temperature adjustable LED light bars of the present utility model are connected in parallel to form an LED dimming module, the first electrodes of the two color temperature adjustable LED light bars are connected, and their connection ends are the first electrodes of the LED dimming module, and the second electrodes of the two color temperature adjustable LED light bars are connected, and their connection ends are the second electrodes of the LED dimming module. As a result, the color temperature adjustable LED light bar of the present utility model can form an LED dimming module by a simple series-parallel connection, and has strong scalability.

[0023] The utility model also discloses a color adjustment driving circuit for driving the above-mentioned LED light strip with adjustable color temperature. The color adjustment driving circuit of the utility model is further described in detail below in conjunction with the embodiments of the drawings.

[0024] Embodiment 1: Figure 5As shown, a color adjustment drive circuit has a positive input terminal, a negative input terminal, a first output terminal, a second output terminal, a control terminal, a positive electrode and a negative electrode. The positive input terminal and the negative input terminal of the color adjustment drive circuit are used to connect a constant current output by an external constant current output power supply. The first output terminal of the color adjustment drive circuit is used to connect to a first electrode of an LED light bar with adjustable color temperature. The second output terminal of the color adjustment drive circuit is used to connect to a second electrode of an LED light bar with adjustable color temperature. When a power supply voltage is connected between the positive and negative electrodes of the color adjustment drive circuit, and an electrical signal is connected to the control terminal, when a constant current is connected between the positive and negative input terminals, the current output between the first output terminal and the second output terminal is equal to the current connected between the positive and negative input terminals, but the direction of the current output between the first output terminal and the second output terminal changes periodically, and the time ratio of the current output between the first output terminal and the second output terminal in the positive and negative directions corresponds to the electrical signal connected to the control terminal.

[0025] When the first output end of the color adjustment driving circuit of this embodiment is connected to the first electrode of the LED light bar with adjustable color temperature, and the second output end thereof is connected to the second electrode of the LED light bar with adjustable color temperature, when different electrical signals are connected to the control end of the color adjustment driving circuit, the ratio of the average light intensity of the LED light bar with adjustable color temperature when emitting light at high color temperature to the average light intensity of the LED light bar with adjustable color temperature when emitting light at low color temperature and the ratio of the emitting time thereof are consistent, thereby presenting different mixed light color temperatures. Similarly, when the first output end of the color adjustment driving circuit of the utility model is connected to the first electrode of the LED dimming module, and the second output end thereof is connected to the second electrode of the LED dimming module, the LED dimming module can also present different mixed light color temperatures.

[0026] Embodiment 2: This embodiment is basically the same as Embodiment 1, except that: Figure 5As shown, a color adjustment driving circuit includes a first integrated circuit U1 of model BP5936D, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor D1 and a second transistor D2, the first capacitor C1 is an electrolytic capacitor, one end of the first resistor R1, one end of the third resistor R3, the emitter of the first transistor D1, the emitter of the second transistor D2, the VH pin of the first integrated circuit U1 and the positive electrode of the first capacitor C1 are connected, and the connection end thereof is the positive input end of the color adjustment driving circuit, the VS pin of the first integrated circuit U1 and the negative electrode of the first capacitor C1 are connected, and the connection end thereof is the negative input end of the color adjustment driving circuit, the other end of the first resistor R1, one end of the second resistor R2, one end of the second capacitor C2 and the base of the first transistor D1 are connected, and the third resistor R5 is connected. The other end of R3, one end of the fourth resistor R4, one end of the third capacitor C3 are connected to the base of the second transistor D2, the collector of the first transistor D1, the other end of the fourth resistor R4, the other end of the third capacitor C3 are connected to the D1 pin of the first integrated circuit U1, and their connection ends are the first output end of the color adjustment drive circuit, the collector of the second transistor D2, the other end of the second resistor R2, the other end of the second capacitor C2 are connected to the D2 pin of the first integrated circuit U1, and their connection ends are the second output end of the color adjustment drive circuit, one end of the fifth resistor R5 is connected to the Rdelay pin of the first integrated circuit U1, the other end of the fifth resistor R5 is connected to the GND pin of the first integrated circuit U1, and its connection end is the negative electrode of the color adjustment drive circuit, the VCC pin of the first integrated circuit U1 is the positive electrode of the color adjustment drive circuit, and the PWM pin of the first integrated circuit U1 is the control end of the color adjustment drive circuit.

[0027] The control end of the color adjustment driving circuit of this embodiment can be connected to either a PWM signal or a DC voltage signal to adjust the time ratio of the current output between the first output end and the second output end in the positive and negative directions, which has high flexibility.

Claims

1. An LED light strip with adjustable color temperature, comprising a substrate and two LED light-emitting circuits, wherein the substrate is sequentially provided with a high color temperature light-emitting area and a low color temperature light-emitting area along its length direction, wherein the high color temperature light-emitting area and the low color temperature light-emitting area are respectively realized by wrapping corresponding fluorescent glue on the substrate, wherein the two LED light-emitting circuits both have a positive electrode and a negative electrode, wherein the two LED light-emitting circuits are respectively referred to as a first LED light-emitting circuit and a second LED light-emitting circuit, wherein the first LED light-emitting circuit is arranged in the high color temperature light-emitting area, and the second LED light-emitting circuit is arranged in the low color temperature light-emitting area ... and wherein the first LED light-emitting circuit is arranged in the high color temperature light-emitting area, and the second LED light-emitting circuit is arranged in the low color temperature light-emitting area, and wherein the first LED light-emitting circuit is arranged in the high color temperature An electrode is provided at each end of the substrate, and the two electrodes are respectively referred to as a first electrode and a second electrode. The positive electrode of the first LED light-emitting circuit and the negative electrode of the second LED light-emitting circuit are both connected to the first electrode, and the negative electrode of the first LED light-emitting circuit and the positive electrode of the second LED light-emitting circuit are both connected to the second electrode.

2. A color adjustment driving circuit for driving the color temperature adjustable LED light strip according to claim 1, characterized in that The color adjustment drive circuit has a positive input terminal, a negative input terminal, a first output terminal, a second output terminal, a control terminal, a positive electrode and a negative electrode. The positive input terminal and the negative input terminal of the color adjustment drive circuit are used to connect a constant current output by an external constant current output power supply. The first output terminal of the color adjustment drive circuit is used to connect to the first electrode of the LED light bar with adjustable color temperature. The second output terminal of the color adjustment drive circuit is used to connect to the second electrode of the LED light bar with adjustable color temperature. When a power supply voltage is connected between the positive and negative electrodes of the color adjustment drive circuit, and an electrical signal is connected to the control terminal, when a constant current is connected between the positive and negative input terminals, the current output between the first and second output terminals is equal to the current connected between the positive and negative input terminals, but the direction of the current output between the first and second output terminals changes periodically, and the time ratio of the current output between the first and second output terminals in the positive and negative directions corresponds to the electrical signal connected to the control terminal.

3. A color adjustment driving circuit according to claim 2, characterized in that The invention comprises a first integrated circuit of model BP5936D, a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor and a second transistor, wherein the first capacitor is an electrolytic capacitor, one end of the first resistor, one end of the third resistor, the emitter of the first transistor, the emitter of the second transistor, the VH pin of the first integrated circuit and the positive electrode of the first capacitor are connected, and the connection end thereof is the positive input end of the color adjustment drive circuit, the VS pin of the first integrated circuit and the negative electrode of the first capacitor are connected, and the connection end thereof is the negative input end of the color adjustment drive circuit, the other end of the first resistor, one end of the second resistor, one end of the second capacitor and the base of the first transistor are connected, the other end of the third resistor, one end of the fourth resistor, the third One end of the capacitor is connected to the base of the second transistor, the collector of the first transistor, the other end of the fourth resistor, and the other end of the third capacitor are connected to the D1 pin of the first integrated circuit, and their connection ends are the first output end of the color adjustment drive circuit, the collector of the second transistor, the other end of the second resistor, and the other end of the second capacitor are connected to the D2 pin of the first integrated circuit, and their connection ends are the second output end of the color adjustment drive circuit, one end of the fifth resistor is connected to the Rdelay pin of the first integrated circuit, the other end of the fifth resistor is connected to the GND pin of the first integrated circuit, and its connection end is the negative electrode of the color adjustment drive circuit, the VCC pin of the first integrated circuit is the positive electrode of the color adjustment drive circuit, and the PWM pin of the first integrated circuit is the control end of the color adjustment drive circuit.

Images