Infrared induction LED lamp driving circuit compatible with power failure emergency function

Abstract

The utility model discloses an infrared induction LED lamp drive circuit compatible with a power failure emergency function. The infrared induction LED lamp drive circuit comprises a rectification circuit, an LED constant current output circuit, an infrared induction control circuit, a battery charging control circuit and an emergency lighting control circuit. The rectifying circuit is respectively connected with the LED constant current output circuit and the battery charging control circuit; the infrared induction control circuit is connected with the LED constant current output circuit, and the battery charging control circuit is connected with the emergency lighting control circuit. The battery protection circuit has over-charge and over-discharge protection functions, so that the battery can be better maintained in an optimal working state. The current ripple is low, the stroboflash is avoided, and the constant current precision is high. The circuit structure is simple, the number of components is small, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and in particular to an infrared induction LED lamp driving circuit compatible with a power failure emergency function. Background Art

[0002] With the acceleration of urbanization and the improvement of people's safety awareness, the demand for emergency lighting is growing. Compared with traditional lighting methods, emergency lighting solutions are suitable for a wider range of lighting markets. At the same time, its reliability and stability have also been widely recognized. Constant current drivers compatible with emergency lighting have an increasing market share. Existing constant current driver solutions compatible with emergency lighting require more IC combinations, which are complex and costly. Therefore, it is necessary to propose an infrared sensing LED lamp drive circuit compatible with power outage emergency function to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to address the deficiencies of the prior art and provide an infrared sensing LED lamp driving circuit compatible with power outage emergency function, so as to solve the problem that the existing constant current driving scheme compatible with emergency lighting requires more IC combinations, the scheme is complex and the cost is high.

[0004] The utility model provides an infrared sensing LED lamp driving circuit compatible with a power outage emergency function, comprising: a rectifier circuit, an LED constant current output circuit, an infrared sensing control circuit, a battery charging control circuit and an emergency lighting control circuit; the rectifier circuit is connected to the LED constant current output circuit and the battery charging control circuit respectively; the infrared sensing control circuit is connected to the LED constant current output circuit, and the battery charging control circuit is connected to the emergency lighting control circuit.

[0005] Furthermore, the rectifier circuit includes a fuse resistor FR1 and a rectifier bridge DB1, and the fuse resistor FR1 is connected to the rectifier bridge DB1.

[0006] Furthermore, the LED constant current output circuit includes an LED linear constant current control chip U1, a current limiting resistor R3 and a current limiting resistor R3A; one end of the current limiting resistor R3 and the current limiting resistor R3A are connected to the REXT pin of the LED linear constant current control chip U1, and the other end of the current limiting resistor R3 and the current limiting resistor R3A are connected to the GND pin of the LED linear constant current control chip U1.

[0007] Furthermore, the infrared sensing control circuit includes an infrared sensing control chip U2, and an OUT pin of the infrared sensing control chip U2 is connected to a DIM pin of the LED linear constant current control chip U1.

[0008] Furthermore, the battery charging control circuit includes a constant voltage and constant current control chip U3, a chip capacitor EC2, a chip capacitor EC3, a chip capacitor EC4, an inductor L1, an inductor L2, a current limiting resistor R6, and a diode D4; the chip capacitor EC3 and the chip capacitor EC4 are connected at both ends of the inductor L1 to form a π-type filter circuit; the DRAIN pin of the constant voltage and constant current control chip U3 is connected between the inductor L1 and the chip capacitor EC4, the CS pin of the constant voltage and constant current control chip U3 is connected to the current limiting resistor R6, the current limiting resistor R6 is respectively connected to one end of the inductor L2 and the diode D4, and the chip capacitor EC2 is connected in parallel with the resistor R7 and connected between the other end of the inductor L2 and the diode D4.

[0009] Furthermore, the emergency lighting control circuit includes an emergency detection control chip U4, a resistor R12, and a capacitor C5 C4 , the EN pin of the emergency detection control chip U4 is connected to the resistor R12, LED1, LED2, LED3, LED4 are connected in parallel to the resistor R12; the VN pin and VL pin of the emergency detection control chip U4 are respectively connected to the capacitor C5 C4 Both ends.

[0010] The utility model has the following beneficial effects: the utility model provides an infrared sensing LED lamp driving circuit compatible with power outage emergency function, which has overcharge and over-discharge protection functions, so that the battery can be better maintained in the best working state. Low current ripple, no flicker, high constant current accuracy. The circuit architecture is simple, the number of components is small, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is the overall framework diagram of the infrared sensing LED lamp driving circuit compatible with the power outage emergency function of the utility model;

[0013] Figure 2 It is a detailed circuit diagram of an infrared sensing LED lamp driving circuit compatible with a power outage emergency function of the utility model. DETAILED DESCRIPTION

[0014] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present application belongs.

[0015] See also Figure 1 The embodiment of the utility model provides an infrared sensing LED lamp driving circuit compatible with the power outage emergency function, including: a rectifier circuit, an LED constant current output circuit, an infrared sensing control circuit, a battery charging control circuit and an emergency lighting control circuit; the rectifier circuit is connected to the LED constant current output circuit and the battery charging control circuit respectively; the infrared sensing control circuit is connected to the LED constant current output circuit, and the battery charging control circuit is connected to the emergency lighting control circuit. First, the input AC voltage is rectified by the rectifier circuit, and then the LED constant current output circuit and the battery charging circuit are powered respectively. The infrared sensing circuit part is directly powered by the power supply pin of the LED constant current chip. At the same time, the emergency lighting control circuit is also connected to it to prepare for power outage emergency lighting.

[0016] Specifically, see Figure 2 The rectifier circuit includes a fuse resistor FR1 and a rectifier bridge DB1, and the fuse resistor FR1 is connected to the rectifier bridge DB1. The fuse resistor FR1 is used to provide abnormal protection for the power supply. The rectifier bridge DB1 is used to provide AC rectification for the circuit, and convert the AC power into DC power for use by the subsequent circuit.

[0017] The LED constant current output circuit includes an LED linear constant current control chip U1, a current limiting resistor R3 and a current limiting resistor R3A; one end of the current limiting resistor R3 and the current limiting resistor R3A is connected to the REXT pin of the LED linear constant current control chip U1, and the other end of the current limiting resistor R3 and the current limiting resistor R3A is connected to the GND pin of the LED linear constant current control chip U1.

[0018] LED linear constant current control chip U1 is a high-efficiency single-channel LED linear constant current control chip with DIM enable port. The chip adopts advanced constant current control technology and has the ability to provide external power supply. When working normally, it can provide 5V output voltage to the outside through the VCC port, so that the external infrared sensing circuit does not need an additional power supply circuit, which can save cost and space. The optional model of LED linear constant current control chip U1 is SM2183E.

[0019] The current limiting resistors R3 and R3A are external current limiting resistors for the REXT pin. By changing the values ​​of these two resistors, the desired output current can be obtained, thereby changing the brightness of the LED lamp. The LED linear constant current control chip U1 has a built-in high-voltage MOSFET and supports high-voltage power supply. The LED linear constant current control chip U1 supports chip parallel application solutions. If the system output power is too large and the chip temperature is high, multiple chips can be used in parallel. There are integrated operational amplifiers and precision voltage references inside, and it has the function of regulating the output current when the temperature drops due to over-temperature.

[0020] The infrared sensing control circuit includes an infrared sensing control chip U2, and an OUT pin of the infrared sensing control chip U2 is connected to a DIM pin of the LED linear constant current control chip U1.

[0021] The infrared sensing control chip U2 is an infrared sensing control chip. When receiving an infrared signal from the outside through the infrared receiving head, the OUT pin of the infrared sensing control chip U2 will output a corresponding PWM signal to the DIM pin of the LED linear constant current control chip U1, thereby controlling the on and off of the output current of the LED linear constant current control chip U1. The optional model of the infrared sensing control chip U2 is SL625.

[0022] The battery charging control circuit includes a constant voltage and constant current control chip U3, a chip capacitor EC2, a chip capacitor EC3, a chip capacitor EC4, an inductor L1, an inductor L2, a current limiting resistor R6, and a diode D4; the chip capacitor EC3 and the chip capacitor EC4 are connected at both ends of the inductor L1 to form a π-type filter circuit to reduce the system's electromagnetic interference to the outside world; the DRAIN pin of the constant voltage and constant current control chip U3 is connected between the inductor L1 and the chip capacitor EC4, the CS pin of the constant voltage and constant current control chip U3 is connected to the current limiting resistor R6, the current limiting resistor R6 is respectively connected to one end of the inductor L2 and the diode D4, and the chip capacitor EC2 is connected in parallel with the resistor R7 and connected between the other end of the inductor L2 and the diode D4.

[0023] The constant voltage and constant current control chip U3 is a high-precision constant voltage and constant current control chip. The chip adopts advanced constant voltage and constant current control technology, with internal integrated operational amplifier, MOSFET and a precision voltage reference. By controlling the switch of MOSFET, the energy storage and transfer of inductor L2 can be realized. The current limiting resistor R6 is an external current limiting resistor for the CS pin of the constant voltage and constant current control chip U3. Changing the resistance value of the current limiting resistor R6 can change the output current value. When the internal MOSFET of the constant voltage and constant current control chip U3 is turned on, the current flows through the 4th pin of the constant voltage and constant current control chip U3 to the internal MOSFET and then flows out from the 5th pin to the current limiting resistor R6, the inductor L2, the chip capacitor EC2 and the load behind it to the ground, forming a complete loop; when the internal MOSFET of the constant voltage and constant current control chip U3 is closed, the inductor L2 provides energy for the load, and the current forms another loop through the inductor L2, the chip capacitor EC2, the load behind it and the diode D4. The optional model of the constant voltage and constant current control chip U3 is BP2525.

[0024] The emergency lighting control circuit includes the emergency detection control chip U4, resistor R12, capacitor C5 C4 , the EN pin of the emergency detection control chip U4 is connected to the resistor R12, LED1, LED2, LED3, LED4 are connected in parallel to the resistor R12; the VN pin and VL pin of the emergency detection control chip U4 are respectively connected to the capacitor C5 C4 Both ends.

[0025] The emergency detection control chip U4 is a chip dedicated to emergency detection control. The chip has high-voltage isolation and detection technology inside. It does not require any peripheral components to directly monitor the state of the AC input signal, and directly or indirectly drives the LED light string. At the same time, it also integrates high-precision single-cell lithium battery management and 0V battery charging functions, and has overcharge and over-discharge protection functions. The EN end supports a series current limiting resistor to directly drive a single string of LEDs, and the EN pin level conversion can be achieved according to the impedance state between VL and VN. When an AC voltage is input between VL and VN, or there is no AC voltage but the equivalent impedance of the detection line is greater than the threshold resistance, the internal switch tubes are cut off, and the EN output is in a high-impedance state. Only when the AC voltage is zero and the impedance between VL and VN is less than the threshold resistance, EN outputs a high level, thereby turning on the emergency LED. The optional model of the emergency detection control chip is QW2889S. For details of other components and connection methods of the infrared sensing LED lamp driving circuit compatible with the power outage emergency function of the embodiment of the present invention, see Figure 2 .

[0026] In summary, the infrared sensing LED lamp driving circuit compatible with the power outage emergency function provided by the embodiment of the utility model has overcharge and over-discharge protection functions, so that the battery can be better maintained in the best working state. Low current ripple, no flicker, high constant current accuracy. The circuit architecture is simple, the number of components is small, and the cost is low.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An infrared sensing LED lamp driving circuit compatible with power outage emergency function, characterized in that: include: Rectification circuit, LED constant current output circuit, infrared sensing control circuit, battery charging control circuit and emergency lighting control circuit; The rectifier circuit is connected to the LED constant current output circuit and the battery charging control circuit respectively; the infrared sensing control circuit is connected to the LED constant current output circuit, and the battery charging control circuit is connected to the emergency lighting control circuit.

2. The infrared sensing LED lamp driving circuit compatible with power failure emergency function as claimed in claim 1, characterized in that: The rectifier circuit includes a fuse resistor FR1 and a rectifier bridge DB1 , and the fuse resistor FR1 is connected to the rectifier bridge DB1 .

3. The infrared sensing LED lamp driving circuit compatible with power failure emergency function as claimed in claim 2, characterized in that: The LED constant current output circuit includes an LED linear constant current control chip U1, a current limiting resistor R3 and a current limiting resistor R3A; one end of the current limiting resistor R3 and the current limiting resistor R3A is connected to the REXT pin of the LED linear constant current control chip U1, and the other end of the current limiting resistor R3 and the current limiting resistor R3A is connected to the GND pin of the LED linear constant current control chip U1.

4. The infrared sensing LED lamp driving circuit compatible with power failure emergency function as claimed in claim 3, characterized in that: The infrared sensing control circuit includes an infrared sensing control chip U2, and an OUT pin of the infrared sensing control chip U2 is connected to a DIM pin of the LED linear constant current control chip U1.

5. The infrared sensing LED lamp driving circuit compatible with power failure emergency function as claimed in claim 4, characterized in that: The battery charging control circuit includes a constant voltage and constant current control chip U3, a chip capacitor EC2, a chip capacitor EC3, a chip capacitor EC4, an inductor L1, an inductor L2, a current limiting resistor R6, and a diode D4; the chip capacitor EC3 and the chip capacitor EC4 are connected at both ends of the inductor L1 to form a π-type filter circuit; the DRAIN pin of the constant voltage and constant current control chip U3 is connected between the inductor L1 and the chip capacitor EC4, the CS pin of the constant voltage and constant current control chip U3 is connected to the current limiting resistor R6, the current limiting resistor R6 is respectively connected to one end of the inductor L2 and the diode D4, and the chip capacitor EC2 is connected in parallel with the resistor R7 and connected between the other end of the inductor L2 and the diode D4.

6. An infrared sensing LED lamp driving circuit compatible with power failure emergency function as claimed in claim 5, characterized in that: The emergency lighting control circuit includes an emergency detection control chip U4, a resistor R12, and a capacitor C4. The EN pin of the emergency detection control chip U4 is connected to the resistor R12, and LED1, LED2, LED3, and LED4 are connected in parallel to the resistor R12; the VN pin and VL pin of the emergency detection control chip U4 are respectively connected to both ends of the capacitor C4.

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