Self-adaptive dual-power LED lamp

Abstract

The utility model belongs to the related technical field of LED circuits, in particular to a self-adaptive dual-power LED lamp, which comprises a power supply module, a rectifying unit, a filter capacitor, an LED power supply chip, an LED lamp string, a first resistor, a second resistor and a switching tube, a pin 1 of the LED power supply chip is connected with an inductor and the LED lamp string, and pins 2 and 3 of the LED power supply chip are connected with the rectifying unit to an anode and a cathode of the power supply module; the pins 2 and 3 of the LED power supply chip are also connected with a filter capacitor; the switching tube comprises a first triode and a second triode. The base electrode of the first triode is connected with one end of the first resistor and one end of the second resistor. According to the self-adaptive dual-power-supply LED lamp circuit, the LED lamp cannot be extinguished due to instant power failure after alternating current and direct current conversion, the lamp can be ensured to be lightened for illumination when a direct current power supply is connected to a low voltage, the use of the lamp is not influenced by the change of the voltage, convenience is brought to the use of people, and the self-adaptive dual-power-supply LED lamp circuit meets the market demand.

Description

Technical Field

[0001] This utility model belongs to the field of LED circuit technology, specifically relating to an adaptive dual-power LED lamp. Background Technology

[0002] LED lighting products are now widely used in daily life, and with the rapid development of LEDs, white LED light sources now have advantages over traditional light sources, such as longer lifespan, less susceptibility to damage in solid-state lighting, high luminous efficacy, mercury-free and environmentally friendly properties, and shock resistance. They are poised to become the third generation of light sources, bringing another revolution to the lighting industry.

[0003] Existing LED lights are often only compatible with 220V voltage. In the event of a fire, flood, or indoor circuit failure, the general lighting LED lights will lose power, causing the indoor lighting to go out and potentially causing confusion. This defect of general lighting LED lights needs to be addressed.

[0004] Therefore, using a dual-purpose lamp with both lighting and emergency functions meets market demand. Furthermore, the lamp is suitable for low-voltage DC and can solve the aforementioned problems. This lamp can also combine the original lighting circuit and emergency circuit into one. Utility Model Content

[0005] To address the problems mentioned in the background section, this invention provides an adaptive dual-power LED lamp. This adaptive dual-power LED lamp circuit ensures that the LED lamp will not extinguish due to a momentary power outage after AC / DC conversion. It can be connected to a DC power supply to ensure illumination even at low voltages. Voltage changes do not affect the lamp's operation, providing convenience and meeting market demands.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an adaptive dual-power LED lamp, comprising a power module, a rectifier unit, a filter capacitor, an LED power chip, an LED string, a first resistor, a second resistor, and a switching transistor. Pin 1 of the LED power chip is connected to an inductor and the LED string, and pins 2 and 3 of the LED power chip are connected to the positive and negative terminals of the rectifier unit to the power module. Pins 2 and 3 of the LED power chip are also connected to a filter capacitor.

[0007] An LED light string consists of multiple LEDs connected in series: a first LED, a second LED, ..., an Nth LED.

[0008] The switching transistor includes a first transistor and a second transistor. The base of the first transistor is connected to one end of a first resistor and one end of a second resistor. The other end of the first resistor is connected to the positive terminal of the power module, and the other end of the second resistor is connected to the negative terminal of the power module. The emitter of the first transistor is connected to the negative terminal of the power module. The collector of the first transistor is connected to the base of the second transistor. The base of the second transistor is connected to a third resistor to the positive terminal of the first LED. The collector of the second transistor is connected to the negative terminal of the first LED, and the emitter of the second transistor is connected to the negative terminal of the power module.

[0009] As a preferred embodiment, the power supply module includes an AC power supply and a DC power supply, wherein the AC power supply is 220V and the DC power supply is 12V.

[0010] As a preferred embodiment, the rectifier unit is a rectifier circuit composed of a first diode, a second diode, a third diode, and a fourth diode, used to convert the voltage output by the power supply into a rectified drive voltage.

[0011] As a preferred embodiment, the first transistor and the second transistor are NPN transistors, with the base of the NPN transistor being the control terminal of the switching transistor.

[0012] As a preferred embodiment, pin 4 of the LED power chip is connected to a fourth resistor to the negative terminal of the power module.

[0013] As a preferred embodiment, the LED power chip is model RD627.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention converts the input AC power into a rectified driving voltage via a rectified rectifier unit. This voltage is then divided by the first and second resistors to drive the first transistor to conduct, bypassing the current flowing into the base of the second transistor Q2 and controlling the second transistor Q2 to remain off. This utilizes an LED power chip to drive and control the high-voltage LED string.

[0016] When the input is a low-voltage DC power supply, the voltage division between the first and second resistors is insufficient to drive the first transistor to conduct. The current flows from the third resistor into the base of the second transistor, which then controls the conduction. The current flows from the positive terminal of the DC power supply through the first LED and the second transistor back to the negative terminal of the DC power supply, thereby enabling the DC power supply to power and light up the first LED, ensuring that the LED can be lit even at low voltage.

[0017] This utility model's adaptive dual-power LED lamp circuit will not extinguish the LED lamp due to a momentary power outage after AC / DC conversion. It can be connected to a DC power supply to ensure that the lamp can be lit even at low voltage. Voltage changes do not affect the use of the lamp, bringing convenience to users and meeting market demands. Attached Figure Description

[0018] Figure 1 This is a circuit diagram of the present invention when there is a dual power input.

[0019] Figure 2 This is another circuit structure diagram for the dual power input of this utility model. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] Please see Figures 1-2 This utility model provides the following technical solution: an adaptive dual-power LED lamp, including a power module, a rectifier unit, a filter capacitor C1, an LED power chip IC1, an LED string, a first resistor R1, a second resistor R2, and a switching transistor. Pin 1 of the LED power chip IC1 is connected to an inductor L1 and the LED string, and pins 2 and 3 of the LED power chip IC1 are connected to the positive and negative terminals of the rectifier unit to the power module. Pins 2 and 3 of the LED power chip IC1 are also connected to the filter capacitor C1.

[0022] An LED light string consists of multiple LED lights connected in series: LED1, LED2, ..., LEDn.

[0023] The switching transistors include a first transistor Q1 and a second transistor Q2. The base of the first transistor Q1 is connected to one end of a first resistor R1 and one end of a second resistor R2. The other end of the first resistor R1 is connected to the positive terminal of the power module, and the other end of the second resistor R2 is connected to the negative terminal of the power module. The emitter of the first transistor Q1 is connected to the negative terminal of the power module. The collector of the first transistor Q1 is connected to the base of the second transistor Q2. The base of the second transistor Q2 is connected to a third resistor R3 to the positive terminal of the first LED LED1. The collector of the second transistor Q2 is connected to the negative terminal of the first LED LED1, and the emitter of the second transistor Q2 is connected to the negative terminal of the power module.

[0024] Specifically, the power module includes an AC power supply (AC) and a DC power supply (DC), with the AC power supply being 220V and the DC power supply being 12V.

[0025] Specifically, the rectifier unit is a rectifier circuit composed of a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, used to convert the voltage output by the power supply into a rectified drive voltage.

[0026] Specifically, the first transistor Q1 and the second transistor Q2 are NPN transistors, and the base of the NPN transistor is the control terminal of the switching transistor.

[0027] Specifically, pin 4 of the LED power chip IC1 is connected to the fourth resistor R4 to the negative terminal of the power module.

[0028] Specifically, the LED power chip IC1 is model RD627.

[0029] The working principle and usage process of this utility model are as follows: When the input power supply is AC (e.g., AC220V), the AC power supply is converted into a rectified driving voltage by the rectifier circuit in the rectifier unit, and then filtered by the filter capacitor C1. Since the AC power supply voltage is relatively high, the rectified driving voltage drives the first transistor Q1 through the voltage division of the first resistor R1 and the second resistor R2. The base of the first transistor Q1 is driven and conducts. The current bypassing the base of the second transistor Q2 is controlled by the second transistor Q2 to prevent it from conducting. Therefore, the LED power chip IC1 drives and controls the LED1, LED2, and LEDn to form a high-voltage light string and illuminates the LEDs.

[0030] When the input is a DC power supply (e.g., DC 12V), due to the low DC voltage, the voltage division between the first resistor R1 and the second resistor R2 is insufficient to drive the first transistor Q1 to conduct. Current flows from the third resistor R3 into the base of the second transistor Q2, which controls its conduction. The current flows from the positive terminal of the DC power supply to the first diode D1, then through the first LED LED1 and the second transistor Q2 back to the negative terminal of the DC power supply, thus enabling the DC power supply to light up the first LED LED1. This allows the LED to be lit even at low voltage, ensuring illumination of the lamps. The circuit uses a switching transistor and resistors to achieve an adaptive dual-power supply driving voltage to control the lighting of the LED string or the first LED LED1. The adaptive dual-power supply LED lamp circuit will not extinguish the lights due to a momentary power outage after AC / DC conversion. It can maintain illumination even at low voltage by connecting a DC power supply, and the voltage change does not affect the lamp's operation, meeting market demands.

[0031] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adaptive dual power LED lamp, characterized by: The power module, rectifier unit, filter capacitor (C1), LED power chip (IC1), LED lamp string, first resistor (R1), second resistor (R2) and switch tube, the pin 1 of the LED power chip (IC1) is connected with the inductor (L1) and the LED lamp string, the pin 2 and 3 of the LED power chip (IC1) are connected with the rectifier unit to the positive and negative poles of the power module; the pin 2 and 3 of the LED power chip (IC1) are also connected with the filter capacitor (C1); The LED lamp string comprises a plurality of series-connected first LED lamp (LED1), second LED lamp (LED2), …, Nth LED lamp (LEDn); The switch tube comprises a first triode (Q1) and a second triode (Q2), the base of the first triode (Q1) is connected with one end of the first resistor (R1) and one end of the second resistor (R2), the other end of the first resistor (R1) is connected with the positive pole of the power module, the other end of the second resistor (R2) is connected with the negative pole of the power module, the emitter of the first triode (Q1) is connected with the negative pole of the power module, the collector of the first triode (Q1) is connected with the base of the second triode (Q2), the base of the second triode (Q2) is connected with the positive pole of the third resistor (R3) to the first LED lamp (LED1), the collector of the second triode (Q2) is connected with the negative pole of the first LED lamp (LED1), and the emitter of the second triode (Q2) is connected with the negative pole of the power module.

2. The adaptive dual power LED lamp of claim 1, wherein: The power module comprises an alternating current power supply (AC) and a direct current power supply (DC), the alternating current power supply (AC) is 220V, and the direct current power supply (DC) is 12V.

3. The adaptive dual power LED lamp of claim 1, wherein: The rectifier unit is composed of a rectifier circuit of a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4), and is used for converting the voltage output by the power supply into a rectified driving voltage.

4. The adaptive dual power LED lamp of claim 1, wherein: The first triode (Q1) and the second triode (Q2) adopt NPN type triodes, and the base of the NPN type triode is the control end of the switch tube.

5. The adaptive dual power supply LED lamp of claim 1, wherein: The pin 4 of the LED power chip (IC1) is connected with the fourth resistor (R4) to the negative pole of the power module.

6. The adaptive dual power supply LED lamp of claim 1, wherein: The model of the LED power chip (IC1) is RD627.

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