LED emergency drive circuit capable of supporting USB power supply

Abstract

The utility model discloses an LED emergency drive circuit capable of supporting USB power supply. The LED emergency drive circuit comprises a rectification filter circuit module, a main drive chip circuit module, an emergency drive control circuit module, an LED output circuit and a USB power supply circuit module. The LED emergency drive circuit capable of supporting USB power supply can support USB power supply, and can drive an LED load to work normally during normal alternating current power supply. Under the condition of power failure, emergency lighting can be automatically started. And a common USB power supply can be used for supplying power, so that the flexibility and the practicability of LED emergency lighting are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to an LED emergency drive circuit that supports USB power supply. Background Technology

[0002] Currently, LED lighting is widely used due to its advantages such as energy saving and long lifespan. However, in some special scenarios, such as power outages or other emergencies, traditional LED lighting cannot function properly. Although there are some emergency lighting products on the market, most have limited functions and do not support convenient USB power supply. In emergency situations, they cannot flexibly utilize common USB power sources, such as power banks, to provide power, thus failing to meet diverse emergency needs. Therefore, there is an urgent need for a hardware circuit solution that does not rely on MCU program control, has a simplified structure, and strong anti-interference capabilities to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to provide an LED emergency driver circuit that supports USB power supply, so as to solve the problem that existing LED emergency lighting does not support USB power supply and the emergency power supply method is inflexible.

[0004] This utility model provides an LED emergency drive circuit that supports USB power supply, including: a rectifier and filter circuit module, a main drive chip circuit module, an emergency drive control circuit module, an LED output circuit, and a USB power supply circuit module;

[0005] The AC input module is connected to the rectifier and filter circuit module and the emergency drive control circuit module. The rectifier and filter circuit module is connected to the LED output circuit and the main drive chip circuit module, respectively. The emergency drive control circuit module and the USB power supply circuit module are connected to the LED output circuit, respectively. The USB power supply circuit module is connected to the emergency drive control circuit module, the emergency drive control circuit module is connected to the main drive chip circuit module, and the main drive chip circuit module is connected to the LED output circuit.

[0006] Furthermore, the rectifier and filter circuit module includes a varistor RV1, a fuse FR1, a rectifier module BD1, and a capacitor EC1. The rectifier module BD1 consists of four diodes. Pin 1 of the rectifier module BD1 is connected to the live wire L of the AC input module via the fuse FR1, and pin 3 is connected to the neutral wire N of the AC input module. One end of the varistor RV1 is connected between the live wire L and the fuse FR1, and the other end of the varistor RV1 is connected between the neutral wire N and pin 3 of the rectifier module BD1. Pin 4 of the rectifier module BD1 is connected to the GND terminal. One end of the capacitor EC1 is connected to pin 2 of the rectifier module BD1, and the other end of the capacitor EC1 is connected to the GND terminal.

[0007] Furthermore, the main driving chip circuit module includes an LED constant current driving control chip U1, an inductor L1, a freewheeling diode D1, a resistor R1, a capacitor EC2, and a resistor R4; one end of the inductor L1 and one end of the freewheeling diode D1 are connected to the two drain pins of the LED constant current driving control chip U1; one end of the resistor R1 is connected to the ROVP pin of the LED constant current driving control chip U1, and the other end of the resistor R1 is connected to the GND terminal; one end of the capacitor EC2 is connected to the other end of the freewheeling diode D1, and the other end of the capacitor EC2 is connected to the other end of the inductor L1; the resistor R4 is connected in parallel with the capacitor EC2.

[0008] Furthermore, the emergency drive control circuit module includes an emergency detection and control dedicated chip U2 and a battery BAT. The battery BAT is connected to the BATP pin of the emergency detection and control dedicated chip U2 and is connected to the LED output circuit.

[0009] Furthermore, the USB power supply circuit module includes a USB power supply interface control chip U3, a MOSFET Q1, a resistor R7, and an open switch SW1; the LED output circuit includes an LED, the LED pin of the USB power supply interface control chip U3 is connected to the LED, and the LED is connected to the battery BAT; one end of the MOSFET Q1 is connected to the battery BAT, and the other end of the MOSFET Q1 is connected to the OUT pin of the USB power supply interface control chip U3; one end of the resistor R7 is connected to the LEST pin of the USB power supply interface control chip U3, the other end of the resistor R7 is connected to one end of the open switch SW1, and the other end of the SW1 is connected to the KEY pin of the USB power supply interface control chip U3.

[0010] This invention offers the following advantages: The USB-powered LED emergency driver circuit supports USB power supply, enabling it to drive LED loads normally under normal AC power. In the event of a power outage, it automatically activates emergency lighting. The ability to utilize common USB power supplies significantly improves the flexibility and practicality of LED emergency lighting. Attached Figure Description

[0011] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 A schematic diagram of the LED emergency drive circuit that supports USB power supply provided by this utility model;

[0013] Figure 2 The circuit diagram of the LED emergency drive circuit that supports USB power supply provided by this utility model. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0015] Please see Figure 1 and Figure 2 This utility model provides an LED emergency drive circuit that supports USB power supply, including: a rectifier and filter circuit module, a main drive chip circuit module, an emergency drive control circuit module, an LED output circuit, and a USB power supply circuit module.

[0016] The AC input module is connected to the rectifier and filter circuit module and the emergency drive control circuit module. The rectifier and filter circuit module is connected to the LED output circuit and the main drive chip circuit module, respectively. The emergency drive control circuit module and the USB power supply circuit module are connected to the LED output circuit, respectively. The USB power supply circuit module is connected to the emergency drive control circuit module, the emergency drive control circuit module is connected to the main drive chip circuit module, and the main drive chip circuit module is connected to the LED output circuit.

[0017] Specifically, the rectifier and filter circuit module includes a varistor RV1, a fuse FR1, a rectifier module BD1, and a capacitor EC1. The rectifier module BD1 consists of four diodes. Pin 1 of the rectifier module BD1 is connected to the live wire L of the AC input module via the fuse FR1, and pin 3 is connected to the neutral wire N of the AC input module. One end of the varistor RV1 is connected between the live wire L and the fuse FR1, and the other end of the varistor RV1 is connected between the neutral wire N and pin 3 of the rectifier module BD1. Pin 4 of the rectifier module BD1 is connected to the GND terminal. One end of the capacitor EC1 is connected to pin 2 of the rectifier module BD1, and the other end of the capacitor EC1 is connected to the GND terminal.

[0018] The AC input module is connected to the power supply. After overvoltage and overcurrent protection by the varistor RV1 and the fuse FR1, it is connected to the rectifier module BD1 to convert AC power into DC power. Finally, it is filtered by the capacitor EC1 before being output.

[0019] Specifically, the main driver chip circuit module includes an LED constant current drive control chip U1, an inductor L1, a freewheeling diode D1, a resistor R1, a capacitor EC2, and a resistor R4. The optional model of the LED constant current drive control chip U1 is KP1071.

[0020] One end of inductor L1 and one end of freewheeling diode D1 are connected to the two Drain pins of LED constant current drive control chip U1; one end of resistor R1 is connected to the ROVP pin of LED constant current drive control chip U1, and the other end of resistor R1 is connected to the GND terminal; one end of capacitor EC2 is connected to the other end of freewheeling diode D1, and the other end of capacitor EC2 is connected to the other end of inductor L1; resistor R4 is connected in parallel with capacitor EC2.

[0021] The filtered DC power is input to the LED constant current drive control chip U1. After processing the current, the LED constant current drive control chip U1 outputs a suitable drive signal, which powers the downstream LED output circuit through components such as inductor L1 and freewheeling diode D1. By adjusting the resistance value of resistor R1, the overvoltage protection point can be changed, thus making it suitable for loads with different voltages. Capacitor EC2 is a filter capacitor, and resistor R4 is the discharge resistor of capacitor EC2.

[0022] Specifically, the emergency drive control circuit module includes an emergency detection and control dedicated chip U2 and a battery BAT. The battery BAT is connected to the BATP pin of the emergency detection and control dedicated chip U2, and the battery BAT is connected to the LED output circuit. The optional model of the emergency detection and control dedicated chip U2 is QW2889.

[0023] The emergency detection and control chip U2 has AC signal detection function, high voltage isolation and detection technology, and can directly monitor the AC input signal status without any external components. The module is connected to a battery BAT. When the power grid suddenly fails, the emergency detection and control chip U2 can power the emergency LED output circuit through the battery BAT to provide backup power during the power outage.

[0024] Specifically, the USB power supply circuit module includes a USB power supply interface control chip U3, a MOSFET Q1, a resistor R7, and an open switch SW1; the LED output circuit includes an LED, with the LED pin of the USB power supply interface control chip U3 connected to the LED, and the LED connected to the battery BAT; one end of the MOSFET Q1 is connected to the battery BAT, and the other end of the MOSFET Q1 is connected to the OUT pin of the USB power supply interface control chip U3; one end of the resistor R7 is connected to the LEST pin of the USB power supply interface control chip U3, and the other end of the resistor R7 is connected to one end of the open switch SW1, with the other end of SW1 connected to the KEY pin of the USB power supply interface control chip U3.

[0025] The USB power supply interface control chip U3 is connected to the circuit. The optional model of the USB power supply interface control chip U3 is QW2675.

[0026] When a USB power source is connected, the emergency LED circuit can be powered by a control circuit consisting of components such as MOSFET Q1, enabling USB power supply and meeting various power supply needs in emergency situations. Resistor R7 is a delay-reduction current-reducing resistor; the rate of current reduction is adjustable for different resistance values. Switch SW1 allows for three brightness levels.

[0027] As can be seen from the above embodiments, the LED emergency drive circuit of this utility model, which supports USB power supply, converts AC input into DC power after being rectified and filtered by the rectifier and filter circuit module. The DC power then flows to the LED load after being processed by the LED constant current drive control chip U1, inductor L1, and diode D1. When the mains power is available, the LED constant current drive control chip U1 operates normally, simultaneously charging the battery through the LED load. When the mains power fails, the emergency drive control circuit module activates emergency output. If the battery is depleted and there is still no power, an external power bank can be used for USB power supply, greatly improving the flexibility and practicality of LED emergency lighting.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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. A USB-powered LED emergency driving circuit, characterized in that, Comprising: Rectifier filter circuit module, main drive chip circuit module, emergency drive control circuit module, LED output circuit and USB power supply circuit module; The AC input module is connected to the rectifier filter circuit module and the emergency drive control circuit module. The rectifier filter circuit module is connected to the LED output circuit and the main drive chip circuit module. The emergency drive control circuit module and the USB power supply circuit module are connected to the LED output circuit. The USB power supply circuit module is connected to the emergency drive control circuit module. The emergency drive control circuit module is connected to the main drive chip circuit module. The main drive chip circuit module is connected to the LED output circuit.

2. The LED emergency driver circuit capable of supporting USB power supply according to claim 1, wherein, The rectifier filter circuit module includes a pressure-sensitive resistor RV1, a fuse FR1, a rectifier module BD1, and a capacitor EC1. The rectifier module BD1 is composed of four diodes. The No. 1 pin of the rectifier module BD1 is connected to the live wire L of the AC input module via the fuse FR1. The No. 3 pin is connected to the neutral wire N of the AC input module. One end of the pressure-sensitive resistor RV1 is connected between the live wire L and the fuse FR1. The other end of the pressure-sensitive resistor RV1 is connected between the neutral wire N and the No. 3 pin of the rectifier module BD1. The No. 4 pin of the rectifier module BD1 is connected to the GND terminal. One end of the capacitor EC1 is connected to the No. 2 pin of the rectifier module BD1. The other end of the capacitor EC1 is connected to the GND terminal.

3. The LED emergency driver circuit capable of supporting USB power supply according to claim 1, wherein, The main drive chip circuit module includes an LED constant current drive control chip U1, an inductor L1, a freewheeling diode D1, a resistor R1, a capacitor EC2, and a resistor R4. One end of the inductor L1 and one end of the freewheeling diode D1 are connected to the two Drain pins of the LED constant current drive control chip U1. One end of the resistor R1 is connected to the ROVP pin of the LED constant current drive control chip U1. The other end of the resistor R1 is connected to the GND terminal. One end of the capacitor EC2 is connected to the other end of the freewheeling diode D1. The other end of the capacitor EC2 is connected to the other end of the inductor L1. The resistor R4 is connected in parallel with the capacitor EC2.

4. The LED emergency driver circuit capable of supporting USB power supply according to claim 1, wherein, The emergency drive control circuit module includes an emergency detection control dedicated chip U2 and a battery BAT. The battery BAT is connected to the BATP pin of the emergency detection control dedicated chip U2. The battery BAT is connected to the LED output circuit.

5. The LED emergency driver circuit capable of supporting USB power supply according to claim 4, wherein, The USB power supply circuit module comprises a USB power supply interface control chip U3, a MOS tube Q1, a resistor R7 and an open SW1; the LED output circuit comprises an LED, an LED pin of the USB power supply interface control chip U3 being connected to the LED, the LED being connected with the battery BAT; one end of the MOS tube Q1 is connected to the battery BAT, the other end of the MOS tube Q1 is connected to an OUT pin of the USB power supply interface control chip U3; one end of the resistor R7 is connected to an LEST pin of the USB power supply interface control chip U3, the other end of the resistor R7 is connected with one end of the open SW1, the other end of the SW1 is connected to a KEY pin of the USB power supply interface control chip U3.

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