Protection circuit of LED lamp strip

Abstract

The utility model discloses a protection circuit for an LED lamp strip, which comprises a voltage input end, a voltage output end, a grounding end, a voltage division circuit module, an MCU controller and a voltage regulation circuit module, and is characterized in that the voltage input end is used for connecting an external input voltage, and the voltage output end is used for transmitting a working voltage to the LED lamp strip; the voltage division circuit module is connected in series between the voltage input end and the voltage output end, the voltage regulation circuit module and the voltage division circuit module are arranged in parallel, and the MCU controller is respectively connected with the voltage division circuit module and the voltage regulation circuit module. The LED lamp strip protection circuit is connected in series between the LED lamp strip and the switching power supply, and the input voltage of the switching power supply is adjusted, so that the working voltage received by the LED lamp strip is within the working range of the LED lamp strip, and the LED lamp strip is prevented from being burnt out.

Description

Technical Field

[0001] The utility model relates to the technical field of LED power supplies, in particular to a protection circuit for an LED strip light. Background Art

[0002] Existing LED strip lights have different structures and require different working voltages. Ordinary LED switching power supplies do not have the function of intelligently identifying the voltage of the strip light. Incorrect operations by consumers during use may cause the LED strip light to be burned out. Therefore, existing LED strip lights require a protection circuit to prevent the LED strip light from being burned out. Summary of the Utility Model

[0003] To solve the above problems, the utility model provides a switching power supply circuit with wide voltage output and constant power and a control method. The specific technical solutions of the utility model are as follows:

[0004] A protection circuit for an LED strip light, comprising: a voltage input terminal, a voltage output terminal, a grounding terminal, a voltage dividing circuit module, an MCU controller, and a voltage regulating circuit module. The voltage input terminal is used to connect an external input voltage, the voltage output terminal is used to supply a working voltage to the LED strip light, the voltage dividing circuit module is connected in series between the voltage input terminal and the voltage output terminal, the voltage regulating circuit module is arranged in parallel with the voltage dividing circuit module, and the MCU controller is respectively connected to the voltage dividing circuit module and the voltage regulating circuit module.

[0005] Further, the voltage dividing circuit module includes a resistor R15, a resistor R16, a resistor R17, a resistor RS, a zener diode ZD1, a triode Q4, and a field effect transistor Q5. The collector of the triode Q4 is connected to the voltage input terminal through the resistor R15, the emitter is connected to the grounding terminal, and the base is connected to the MCU controller through the resistor R17; the input terminal of the zener diode ZD1 is connected to the emitter of the triode Q4, and the output terminal is connected to the collector of the triode Q4; one end of the resistor R16 is connected to the base of the triode Q4, and the other end is connected to the emitter of the triode Q4; the source of the field effect transistor Q5 is connected to the emitter of the triode Q4, the gate is connected to the collector of the triode Q4, and the drain is respectively connected to the grounding terminal and the MCU controller; one end of the resistor RS is connected to the source of the field effect transistor Q5, and the other end is connected to the drain of the field effect transistor Q5.

[0006] Further, the protection circuit further includes a resistor R18 and a capacitor C6. One end of the resistor R18 is connected to the signal sampling terminal of the MCU controller, and the other end is connected to the drain of the field effect transistor Q5. One end of the capacitor C6 is connected to the signal sampling terminal of the MCU controller, and the other end is connected to the grounding terminal. The drive signal transmitting terminal of the MCU controller is connected to the base of the triode Q4 through the resistor R17.

[0007] Further, the voltage regulation circuit module includes a triode Q3, a resistor R7, a resistor R8, a light-emitting diode PCA, a zener diode ZD2, and a controllable zener diode U1. The collector of the triode Q3 is connected to the voltage input terminal, the base is connected to the output terminal of the zener diode ZD2, the emitter is connected to the light-emitting diode PCA through the resistor R7, and the input terminal of the zener diode ZD2 is connected to the ground terminal; one end of the resistor R8 is connected to the collector of the triode Q3, and the other end is connected to the base of the triode Q3; the input terminal of the light-emitting diode PCA is connected to the emitter of the triode Q3 through the resistor R7, and the output terminal is connected to the output terminal of the controllable zener diode U1; the input terminal of the controllable zener diode U1 is connected to the ground terminal, and the control terminal is connected to the MCU controller.

[0008] Further, the protection circuit further includes a resistor R13, a resistor R14, and a resistor R15. One end of the resistor R13 is connected to the MCU controller, and the other end is connected to the control terminal of the controllable zener diode U1. One end of the resistor R14 is connected to the MCU controller through the resistor R13, and the other end is connected to the input terminal of the zener diode ZD2. One end of the resistor R15 is connected to the voltage input terminal, and the other end is connected to the MCU controller through the resistor R13.

[0009] Further, the protection circuit further includes a capacitor C2, and the capacitor C2 is connected in parallel with the voltage division circuit module.

[0010] Further, the protection circuit further includes a diode ZD3. The input terminal of the diode is connected to the voltage input terminal, and the output terminal is respectively connected to the capacitor C2, the voltage division circuit module, and the voltage regulation circuit module.

[0011] Compared with the prior art, the present utility model has at least the following beneficial effects: The LED strip protection circuit described in this application is connected in series between the LED strip and the switching power supply, and is connected in parallel with the LED strip through the voltage division circuit module to divide the voltage of the LED strip, preventing the working voltage received by the LED strip from being too high and causing the LED strip to be burned out; when the voltage received by the LED strip is too low or too high, the working voltage received by the LED strip is adjusted through the voltage regulation circuit module, so that the LED strip always works at a suitable working voltage, improving the working efficiency of the LED strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the circuit schematic diagram of the embodiment;

[0013] Figure 2 is the circuit diagram of the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The following embodiments are used to illustrate the present utility model, but the present utility model is not limited by these embodiments. Modifying the specific implementation manners of the present utility model or making equivalent replacements for some technical features without departing from the spirit of the present utility model scheme shall all be covered within the scope of the technical solution claimed by the present utility model.

[0015] As Figure 1 and Figure 2 shown, a protection circuit for an LED strip includes: a voltage input terminal VCC, a voltage output terminal V, a ground terminal GND, a voltage dividing circuit module, an MCU controller, and a voltage regulating circuit module. The voltage input terminal VCC is used to connect an external input voltage. The voltage output terminal V is used to supply a working voltage to the LED strip. The voltage dividing circuit module is connected in series between the voltage input terminal VCC and the voltage output terminal V. The voltage regulating circuit module is arranged in parallel with the voltage dividing circuit module. The MCU controller is respectively connected to the voltage dividing circuit module and the voltage regulating circuit module. The input voltage of the voltage input terminal VCC is 5 - 48V. During operation, the voltage dividing circuit module divides the working voltage of the LED strip. The MCU controller samples the working voltage of the LED strip through the voltage dividing circuit module. When it is obtained that the working voltage of the LED strip exceeds the preset range, a control signal is sent to the triode Q3 to turn on or off the triode Q3, reducing the working voltage of the LED strip to prevent the LED strip from being burned out. When it is obtained that the working voltage of the LED strip is too low, a control signal is sent to the triode Q3 to turn on or off the triode to increase the working voltage of the LED strip.

[0016] As one of the embodiments, the voltage dividing circuit module includes a resistor R15, a resistor R16, a resistor R17, a resistor RS, a zener diode ZD1, a triode Q4, and a field effect transistor Q5. The collector of the triode Q4 is connected to the voltage input terminal VCC through the resistor R15, the emitter is connected to the ground terminal GND, and the base is connected to the MCU controller through the resistor R17. The input terminal of the zener diode ZD1 is connected to the emitter of the triode Q4, and the output terminal is connected to the collector of the triode Q4. One end of the resistor R16 is connected to the base of the triode Q4, and the other end is connected to the emitter of the triode Q4. The source of the field effect transistor Q5 is connected to the emitter of the triode Q4, the gate is connected to the collector of the triode Q4, and the drain is respectively connected to the ground terminal GND and the MCU controller. One end of the resistor RS is connected to the source of the field effect transistor Q5, and the other end is connected to the drain of the field effect transistor Q5.

[0017] As one of the embodiments, the protection circuit further includes a resistor R18 and a capacitor C6. One end of the resistor R18 is connected to the signal sampling terminal of the MCU controller, and the other end is connected to the drain of the field-effect transistor Q5. One end of the capacitor C6 is connected to the signal sampling terminal of the MCU controller, and the other end is connected to the ground terminal GND. The driving signal transmitting terminal of the MCU controller is connected to the base of the triode Q4 through a resistor R17.

[0018] As one of the embodiments, the voltage regulation circuit module includes a triode Q3, a resistor R7, a resistor R8, a light-emitting diode PCA, a voltage stabilizing diode ZD2, and a controllable voltage stabilizing diode U1. The collector of the triode Q3 is connected to the voltage input terminal VCC, the base is connected to the output terminal of the voltage stabilizing diode ZD2, and the emitter is connected to the light-emitting diode PCA through a resistor R7. The input terminal of the voltage stabilizing diode ZD2 is connected to the ground terminal GND; one end of the resistor R8 is connected to the collector of the triode Q3, and the other end is connected to the base of the triode Q3; the input terminal of the light-emitting diode PCA is connected to the emitter of the triode Q3 through a resistor R7, and the output terminal is connected to the output terminal of the controllable voltage stabilizing diode U1; the input terminal of the controllable voltage stabilizing diode U1 is connected to the ground terminal GND, and the control terminal is connected to the MCU controller.

[0019] As one of the embodiments, the protection circuit further includes a resistor R13, a resistor R14, and a resistor R15. One end of the resistor R13 is connected to the MCU controller, and the other end is connected to the control terminal of the controllable voltage stabilizing diode U1. One end of the resistor R14 is connected to the MCU controller through the resistor R13, and the other end is connected to the input terminal of the voltage stabilizing diode ZD2. One end of the resistor R15 is connected to the voltage input terminal VCC, and the other end is connected to the MCU controller through the resistor R13.

[0020] As one of the embodiments, the protection circuit further includes a capacitor C2, and the capacitor C2 is connected in parallel with the voltage division circuit module.

[0021] As one of the embodiments, the protection circuit further includes a diode ZD3. The input terminal of the diode is connected to the voltage input terminal VCC, and the output terminal is respectively connected to the capacitor C2, the voltage division circuit module, and the voltage regulation circuit module.

[0022] The LED strip protection circuit described in this application is connected in series between the LED strip and the switching power supply, and is connected in parallel with the LED strip through the voltage division circuit module to divide the voltage of the LED strip, preventing the LED strip from receiving too high a working voltage and causing the LED strip to be burned out; when the voltage received by the LED strip is too low or too high, the voltage regulation circuit module adjusts the working voltage received by the LED strip, so that the LED strip always works at a suitable working voltage, improving the working efficiency of the LED strip.

[0023] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the creative concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A protection circuit for an LED light strip, characterized in that, Comprising: A voltage input terminal, a voltage output terminal, a ground terminal, a voltage dividing circuit module, an MCU controller, and a voltage regulating circuit module. The voltage input terminal is used to connect to an external input voltage. The voltage output terminal is used to supply a working voltage to an LED light strip. The voltage dividing circuit module is connected in series between the voltage input terminal and the voltage output terminal. The voltage regulating circuit module is arranged in parallel with the voltage dividing circuit module. The MCU controller is respectively connected to the voltage dividing circuit module and the voltage regulating circuit module.

2. The protection circuit of the LED light strip according to claim 1, characterized in that, The voltage dividing circuit module includes a resistor R15, a resistor R16, a resistor R17, a resistor RS, a zener diode ZD1, a triode Q4, and a field effect transistor Q5. The collector of the triode Q4 is connected to the voltage input terminal through the resistor R15, the emitter is connected to the ground terminal, and the base is connected to the MCU controller through the resistor R17. The input terminal of the zener diode ZD1 is connected to the emitter of the triode Q4, and the output terminal is connected to the collector of the triode Q4. One end of the resistor R16 is connected to the base of the triode Q4, and the other end is connected to the emitter of the triode Q4. The source of the field effect transistor Q5 is connected to the emitter of the triode Q4, the gate is connected to the collector of the triode Q4, and the drain is respectively connected to the ground terminal and the MCU controller. One end of the resistor RS is connected to the source of the field effect transistor Q5, and the other end is connected to the drain of the field effect transistor Q5.

3. The protection circuit of the LED light strip according to claim 2, characterized in that The protection circuit further includes a resistor R18 and a capacitor C6. One end of the resistor R18 is connected to the signal sampling terminal of the MCU controller, and the other end is connected to the drain of the field effect transistor Q5. One end of the capacitor C6 is connected to the signal sampling terminal of the MCU controller, and the other end is connected to the ground terminal. The drive signal transmitting terminal of the MCU controller is connected to the base of the triode Q4 through the resistor R17.

4. The protection circuit of the LED light strip according to claim 1, characterized in that, The voltage regulating circuit module includes a triode Q3, a resistor R7, a resistor R8, a light emitting diode PCA, a zener diode ZD2, and a controllable zener diode U1. The collector of the triode Q3 is connected to the voltage input terminal, the base is connected to the output terminal of the zener diode ZD2, and the emitter is connected to the light emitting diode PCA through the resistor R7. The input terminal of the zener diode ZD2 is connected to the ground terminal. One end of the resistor R8 is connected to the collector of the triode Q3, and the other end is connected to the base of the triode Q3. The input terminal of the light emitting diode PCA is connected to the emitter of the triode Q3 through the resistor R7, and the output terminal is connected to the output terminal of the controllable zener diode U1. The input terminal of the controllable zener diode U1 is connected to the ground terminal, and the control terminal is connected to the MCU controller.

5. The protection circuit of the LED light strip according to claim 4, characterized in that, The protection circuit further includes a resistor R13, a resistor R14, and a resistor R15. One end of the resistor R13 is connected to the MCU controller, and the other end is connected to the control terminal of the controllable zener diode U1. One end of the resistor R14 is connected to the MCU controller through the resistor R13, and the other end is connected to the input terminal of the zener diode ZD2. One end of the resistor R15 is connected to the voltage input terminal, and the other end is connected to the MCU controller through the resistor R13.

6. The protection circuit of the LED light strip according to claim 1, characterized in that The protection circuit further includes a capacitor C2, and the capacitor C2 is connected in parallel with the voltage dividing circuit module.

7. The protection circuit of the LED light strip according to claim 6, characterized in that, The protection circuit further includes a diode ZD3. The input end of the diode is connected to the voltage input end, and the output end is respectively connected to a capacitor C2, a voltage dividing circuit module, and a voltage regulating circuit module.

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