Lamp strip driving circuit

Abstract

The utility model relates to the technical field of power supply driving, in particular to a lamp strip driving circuit, which comprises a driving circuit, a backup circuit, a switching circuit, an Internet of Things module and a detection circuit, the power supply end of an external lamp strip is connected with one input end of the switching circuit, the switching circuit is provided with two output ends, one output end is connected with the driving circuit, and the other output end is connected with the backup circuit. One path of output section is connected with the detection circuit, the other path of output section is connected with the backup circuit, the detection end of the detection circuit is connected with the driving circuit, the output end of the detection circuit is connected with the input end of the Internet of Things module, and the output end of the Internet of Things module is connected with the control end of the switching circuit. Problems occurring in use can be handled, and good use experience is provided for circuit operation.

Description

Technical Field

[0001] This utility model relates to the field of power supply driving technology, specifically to a light strip driving circuit. Background Technology

[0002] Currently, each LED strip is driven by a MOSFET. During use, the MOSFETs often burn out, manifesting as source and drain breakdown, making it impossible to control the brightness of the LEDs. The reason for this is that when the LED strip reaches a certain length, its distributed inductance becomes significant, and the LED strip can be considered an inductive load. When the current in the LED strip changes drastically, a large induced electromotive force is generated between the source and drain of the MOSFET. When the induced electromotive force exceeds the maximum withstand voltage of the MOSFET, the MOSFET breaks down and loses its control function. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a light strip driving circuit.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a light strip driving circuit, including a driving circuit, a backup circuit, a switching circuit, an Internet of Things (IoT) module, and a detection circuit. The power supply terminal of the external light strip is connected to an input terminal of the switching circuit. The switching circuit has two output terminals, one of which is connected to the driving circuit and the other is connected to the backup circuit. The detection terminal of the detection circuit is connected to the driving circuit, the output terminal of the detection circuit is connected to the input terminal of the IoT module, and the output terminal of the IoT module is connected to the control terminal of the switching circuit.

[0005] In some embodiments, the driving circuit includes a MOSFET and a diode. The negative terminal of the diode is connected to the drain of the MOSFET, the positive terminal of the diode is connected to the source of the MOSFET and then grounded, the drain of the MOSFET is connected to one of the output terminals of the switching circuit, and the gate of the MOSFET is connected to one of the output terminals of the IoT module.

[0006] In some embodiments, the driving circuit includes a MOSFET and a diode. The negative terminal of the diode is connected to the drain of the MOSFET, the positive terminal of the diode is connected to the source of the MOSFET and then grounded, the drain of the MOSFET is connected to another output terminal of the switching circuit, and the gate of the MOSFET is connected to one output terminal of the IoT module.

[0007] In some embodiments, the detection circuit includes a sampling resistor and a current amplifier. One end of the sampling resistor is connected to the source of a MOSFET, and the other end is grounded. The input terminals of the current amplifier are connected to both ends of the sampling resistor, and the output terminal of the current amplifier is connected to the input terminal of the IoT module.

[0008] In some embodiments, the switching circuit includes a relay and a transistor. The relay's contact input terminal is connected to an external LED strip, the relay's normally closed contact output terminal is connected to a drive circuit, the relay's normally open contact output terminal is connected to a backup circuit, one end of the relay's coil is connected to a power supply, and the other end is connected to the collector of the transistor. The transistor's base is connected to the output terminal of the IoT module, and the transistor's emitter is grounded.

[0009] In some embodiments, an RC circuit is connected in parallel on the external light strip, and a diode is connected in series on the RC circuit.

[0010] Compared with the prior art, the beneficial effects of this utility model are: it adds protection circuits and backup circuits to address the problem of unstable circuit components during the operation of the LED strip circuit, increases self-testing capabilities, and can automatically handle problems that occur during use, providing a better user experience.

[0011] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. The embodiments of this application will provide a detailed description and understanding of the application. Attached Figure Description

[0012] Figure 1 This is a module connection diagram of the present invention;

[0013] Figure 2 This is the circuit schematic diagram of this utility model;

[0014] Figure 3 This is a flowchart of the switching control of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-3 This utility model provides a technical solution: a light strip driving circuit, including a driving circuit, a backup circuit, a switching circuit, an Internet of Things (IoT) module, and a detection circuit. The power supply terminal of the external light strip is connected to an input terminal of the switching circuit. The switching circuit has two output terminals, one of which is connected to the driving circuit and the other is connected to the backup circuit. The detection terminal of the detection circuit is connected to the driving circuit, the output terminal of the detection circuit is connected to the input terminal of the IoT module, and the output terminal of the IoT module is connected to the control terminal of the switching circuit.

[0017] The LED beads are connected in series and then in parallel to form a light strip assembly. One end of the assembly is connected to the power supply, and the other end is connected to a switching circuit. The two outputs of the switching circuit are connected to the driving circuit and the backup circuit, respectively. The driving circuit is detected by a detection circuit and controlled by an IoT module. Under normal conditions, the light strip is controlled by the driving circuit. If the driving circuit fails, the switching circuit switches to the backup circuit to enable the light strip to continue running.

[0018] The IoT module is a processor with WIFI and Bluetooth functions purchased from the existing market. It is used to process and control the entire circuit, and also provides mobile phone access. When working, it checks the voltage and current parameters of the drive circuit through the detection circuit to determine whether the circuit is normal. When an abnormality occurs, it controls the switching circuit to cut off the drive circuit and activate the backup circuit. At the same time, it uploads the fault handling information to the mobile phone.

[0019] like Figure 2 As shown, based on the above scheme, in practical applications, the driving circuit includes a MOSFET Q1 and a diode D2. The negative terminal of the diode D2 is connected to the drain of the MOSFET Q1, the positive terminal of the diode D2 is connected to the source of the MOSFET Q1 and then grounded, the drain of the MOSFET Q1 is connected to one of the output terminals of the switching circuit, and the gate of the MOSFET Q1 is connected to one of the output terminals of the IoT module U1.

[0020] The driving circuit includes a MOSFET Q2 and a diode D3. The negative terminal of the diode D3 is connected to the drain of the MOSFET Q2, and the positive terminal of the diode D3 is connected to the source of the MOSFET Q2 and then grounded. The drain of the MOSFET Q2 is connected to another output terminal of the switching circuit, and the gate of the MOSFET Q2 is connected to one output terminal of the IoT module U1.

[0021] The detection circuit includes a sampling resistor R2 and a current amplifier U6. One end of the sampling resistor R2 is connected to the source of the MOSFET Q1, and the other end is grounded. The input terminals of the current amplifier U6 are connected to both ends of the sampling resistor R2, and the output terminal of the current amplifier U6 is connected to the input terminal of the IoT module U2.

[0022] The switching circuit includes a relay U4 and a transistor Q3. The input terminal of the relay U4 is connected to an external LED strip, the normally closed output terminal of the relay U4 is connected to a drive circuit, the normally open output terminal of the relay U4 is connected to a backup circuit, one end of the coil of the relay U4 is connected to a power supply, and the other end is connected to the collector of the transistor Q3. The base of the transistor Q3 is connected to the output terminal of the IoT module, and the emitter of the transistor Q3 is grounded.

[0023] An RC circuit (resistor R6 and capacitor C3 in parallel) is connected in parallel on the external light strip, and a diode D4 is connected in series in the RC circuit, with the negative terminal of diode D4 connected in the direction of the power supply.

[0024] In this technical solution, the LEDs are connected in series and then in parallel to form a 6-meter LED strip, which is then connected to the power supply through resistor R1. Resistor R1 acts as a current limiter. Diode D2 is a transient suppression diode, with its negative terminal connected to the drain of MOSFET Q1 and its positive terminal connected to the source of Q1. The breakdown voltage of diode D2 is less than the maximum voltage that MOSFET Q1 can withstand. When the induced voltage of the LED strip reaches the breakdown voltage of diode D2, diode D2 quickly changes from a high-resistance state to a low-resistance state, releasing the induced voltage in the LED strip.

[0025] The diode D4, resistor R6, and capacitor C3 connected in parallel on the light strip form an absorption circuit to absorb and suppress the peak voltage formed at the drain of the MOSFET Q1 when it is turned off. The capacitor C3 is in a charging state, absorbing the induced high voltage and releasing the energy through the diode D4.

[0026] During normal operation, pins 3 and 4 of relay U4 are connected. The current of the LED bead flows into the negative terminal through relay U4, MOSFET Q1, and resistor R2. Resistor R2 is a current sampling resistor. Its voltage drop is amplified by current amplifier U6 and sampled by pin 4 of IoT module U2. After processing by ADC, it is output.

[0027] The IoT module U2 controls dimming via pin 3 and simultaneously detects changes in the voltage across R2. When MOSFET Q1 is damaged, the voltage drop across R2 will not change with the dimming signal, indicating that MOSFET Q1 is damaged.

[0028] When a breakdown of MOSFET Q1 is detected, IoT module U2 outputs a control signal to transistor Q3, which turns on. Pin 1 of U4 outputs a high level, and pins 4 and 3 of relay U4 are disconnected, while pins 4 and 2 are connected. This disconnects MOSFET Q1, and MOSFET Q2 is connected to the circuit to control dimming, thus completing the circuit switching.

[0029] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A LED strip driving circuit, characterized in that: It includes a driving circuit, a backup circuit, a switching circuit, an IoT module, and a detection circuit. The power supply terminal of the external light strip is connected to one input terminal of the switching circuit. The switching circuit has two output terminals, one of which is connected to the driving circuit and the other is connected to the backup circuit. The detection terminal of the detection circuit is connected to the driving circuit, the output terminal of the detection circuit is connected to the input terminal of the IoT module, and the output terminal of the IoT module is connected to the control terminal of the switching circuit.

2. The LED strip driving circuit according to claim 1, characterized in that: The driving circuit includes a MOSFET and a diode. The negative terminal of the diode is connected to the drain of the MOSFET, the positive terminal of the diode is connected to the source of the MOSFET and then grounded, the drain of the MOSFET is connected to one of the output terminals of the switching circuit, and the gate of the MOSFET is connected to one of the output terminals of the IoT module.

3. The LED strip driving circuit according to claim 1, characterized in that: The driving circuit includes a MOSFET and a diode. The negative terminal of the diode is connected to the drain of the MOSFET, the positive terminal of the diode is connected to the source of the MOSFET and then grounded, the drain of the MOSFET is connected to another output terminal of the switching circuit, and the gate of the MOSFET is connected to one output terminal of the IoT module.

4. The LED strip driving circuit according to claim 2, characterized in that: The detection circuit includes a sampling resistor and a current amplifier. One end of the sampling resistor is connected to the source of a MOSFET, and the other end is grounded. The input terminals of the current amplifier are connected to both ends of the sampling resistor, and the output terminal of the current amplifier is connected to the input terminal of the IoT module.

5. A light strip driving circuit according to claim 1, characterized in that: The switching circuit includes a relay and a transistor. The relay's input contact is connected to an external LED strip, the relay's normally closed output contact is connected to a drive circuit, the relay's normally open output contact is connected to a backup circuit, one end of the relay's coil is connected to a power supply, and the other end is connected to the collector of the transistor. The transistor's base is connected to the output of the IoT module, and the transistor's emitter is grounded.

6. A light strip driving circuit according to claim 2, characterized in that: An RC circuit is connected in parallel on the external light strip, and a diode is connected in series on the RC circuit.

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