Electro-luminescent sheet driving circuit with controllable output frequency

Abstract

The utility model discloses a cold light sheet driving circuit with controllable output frequency, which comprises a USB charging circuit, a high voltage generating circuit, an MCU main control circuit, a sound rhythm circuit and a flow output control circuit, the USB charging circuit comprises a charging interface TYPE-C, a pin B9 and a pin A9 of the charging interface TYPE-C are connected to form an accessed positive electrode which is connected with a pin 6 of a charging and discharging management chip U4, and a pin 7 of the charging and discharging management chip U4 is connected with a pin 7 of the charging and discharging management chip U4. A first pin of the charging and discharging management chip U4 is connected with the high-voltage generation circuit, and the high-voltage generation circuit transformer L6 is connected with the running water output control circuit. The device is small in size, convenient to install, easy to maintain, high in anti-interference capability, extremely low in energy consumption, and capable of providing real-time position monitoring; the sensitivity is high, and high-brightness EL-adjusting cold light sheet driving is provided; by dynamically modifying the output frequency of each path, the consistency of brightness output is realized, and the sound of magnetic saturation is reduced by modifying the output frequency of the main control chip.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, in particular to an EL cold cathode fluorescent lamp driving circuit with controllable output frequency. Background Art

[0002] At present, the output frequency of EL cold cathode fluorescent lamps on the market is fixed. When encountering water flow control, especially when the switching areas are not the same size, the brightness will be uneven; moreover, the generated high voltage will cause a zizzi sound due to magnetic saturation. Those skilled in the art provide an EL cold cathode fluorescent lamp driving circuit with controllable output frequency, which can dynamically modify the frequency of each output to achieve consistent brightness output, and reduce the magnetic saturation sound by modifying the output frequency of the main control chip. Summary of the Invention

[0003] The purpose of the utility model is to solve the above technical problems and provide an EL cold cathode fluorescent lamp driving circuit with controllable output frequency, which can monitor the grounding situation of the terminal human body or device in real time, and if it exceeds the setting, it will remind in the form of sound and light alarm.

[0004] In order to achieve the above technical purpose and meet the above technical requirements, the technical solution adopted by the utility model is: an EL cold cathode fluorescent lamp driving circuit with controllable output frequency, including a USB charging circuit, a high-voltage generating circuit, an MCU main control circuit, a sound rhythm circuit, and a water flow output control circuit. The USB charging circuit includes a charging interface TYPE-C. The B9 and A9 pins of the charging interface TYPE-C are connected to be the positive electrode for access and are connected to the 6th pin of the charge and discharge management chip U4. The rear end of the circuit is connected with a resistor R30 and a capacitor C13. The A5 pin of the charging interface TYPE-C is connected to a resistor R1 and then grounded, and the B5 pin is connected to a resistor R2 and then grounded. The 7th pin of the charge and discharge management chip U4 is connected to a resistor R28, an LED1 and then grounded. The 8th pin is connected to a resistor R29, an LED2 and then grounded. The 4th pin is connected to the negative electrode of the lithium battery. The 3rd pin is connected to an inductor L5 and a capacitor C11 and then grounded. The 1st pin is connected to the high-voltage generating circuit;

[0005] The high-voltage generating circuit includes triodes U5, U6, U7, U8. The bases of the triodes U5 and U6 are connected to a resistor R35 and then connected to the 20th pin of the main control chip U3. The emitters are connected to a resistor R31 and then connected to the field effect transistor Q16. The bases of the triodes U7 and U8 are connected to a resistor R36 and then connected to the 19th pin of the main control chip U3. The emitters are connected to a resistor R33 and then connected to the field effect transistor Q17. The field effect transistors Q16 and Q17 are respectively connected to the transformer L6. The transformer L6 is connected to the water flow output control circuit;

[0006] The MCU main control circuit includes a main control chip U3. The 5th pin of the main control chip U3 is connected to the positive pole of the 5V power supply, the 7th pin is connected to the negative pole of the power supply, the 10th pin is connected to the 1st pin of the switch SW1, the 2nd pin of the switch SW1 is grounded, and the 18th pin of the main control chip U3 is connected to the resistor R26 and then connected to the MOS transistor Q13.

[0007] Preferably, the sound rhythm circuit includes MIC1. The positive pole of MIC1 is connected to the capacitor C5 and then connected to the triode Q15. The resistors R7 and R6 are connected in series and then connected in parallel with the capacitor C5. The triode Q15 is connected to the triode Q14, and the triode Q14 is connected to the resistor R25 and then connected to the 2nd pin of the main control chip U3.

[0008] Preferably, the flowing water output control circuit includes four independent outputs, which are controlled by the main control chip U3. The 11th pin of the main control chip U3 is connected to the resistor R18 and then connected to the MOS transistor Q12, the 12th pin is connected to the resistor R19 and then connected to the MOS transistor Q11, the 13th pin is connected to the resistor R20 and then connected to the MOS transistor Q10, the 14th pin is connected to the resistor R21 and then connected to the MOS transistor Q9. The resistors R17, R16, R23, and R22 are the pull-down resistors of the MOS transistors, which improve the control accuracy of the MCU main control circuit.

[0009] Compared with the traditional structure, the beneficial effects of the present utility model are as follows: The size of the present utility model is only 28*32*12mm, and it is installed inside a special plastic shell. It not only has a small volume, is convenient to install and easy to maintain, but also has a strong anti-interference ability, extremely low energy consumption, and can provide real-time position monitoring; it has high sensitivity and can provide high-brightness EL cold light sheet drive; by dynamically modifying the frequency of each output, the consistency of the brightness output is achieved, and the magnetic saturation sound is reduced by modifying the output frequency of the main control chip. Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the circuit structure of the present utility model;

[0011] In the figure: 1. USB charging circuit, 2. High-voltage generation circuit, 3. Sound rhythm circuit, 4. MCU main control circuit, 5. Flowing water output control circuit. Detailed Embodiment

[0012] The present utility model will be further described below.

[0013] Refer to the attached Figure 1, an EL cold cathode fluorescent lamp driving circuit with controllable output frequency, comprising a USB charging circuit 1, a high-voltage generating circuit 2, an MCU main control circuit 4, a sound rhythm circuit 3, and a flowing water output control circuit 5. The USB charging circuit 4 includes a charging interface TYPE-C. The B9 and A9 pins of the charging interface TYPE-C are connected to form the positive electrode for access and are connected to the 6th pin of the charge and discharge management chip U4. The rear end of the circuit is connected with a resistor R30 and a capacitor C13. The A5 pin of the charging interface TYPE-C is connected to a resistor R1 and then grounded, and the B5 pin is connected to a resistor R2 and then grounded. The 7th pin of the charge and discharge management chip U4 is connected to a resistor R28, an LED1 and then grounded. The 8th pin is connected to a resistor R29, an LED2 and then grounded. The 4th pin is connected to the negative electrode of the lithium battery. The 3rd pin is connected to an inductor L5, a capacitor C11 and then grounded. The 1st pin is connected to the high-voltage generating circuit 2;

[0014] The high-voltage generating circuit 2 includes transistors U5, U6, U7, U8. The bases of the transistors U5 and U6 are connected to a resistor R35 and then connected to the 20th pin of the main control chip U3. The emitters are connected to a resistor R31 and then connected to the field effect transistor Q16. The bases of the transistors U7 and U8 are connected to a resistor R36 and then connected to the 19th pin of the main control chip U3. The emitters are connected to a resistor R33 and then connected to the field effect transistor Q17. The field effect transistors Q16 and Q17 are respectively connected to a transformer L6. The transformer L6 is connected to the flowing water output control circuit;

[0015] The MCU main control circuit 4 includes a main control chip U3. The 5th pin of the main control chip U3 is connected to the positive electrode of the 5V power supply. The 7th pin is connected to the negative electrode of the power supply. The 10th pin is connected to the 1st pin of the switch SW1. The 2nd pin of the switch SW1 is grounded. The 18th pin of the main control chip U3 is connected to a resistor R26 and then connected to the MOS transistor Q13;

[0016] The sound rhythm circuit 3 includes a MIC1. The positive electrode of the MIC1 is connected to a capacitor C5 and then connected to a transistor Q15. The resistors R7 and R6 are connected in series and then connected in parallel with the capacitor C5. The transistor Q15 is connected to the transistor Q14. The transistor Q14 is connected to a resistor R25 and then connected to the 2nd pin of the main control chip U3;

[0017] The flowing water output control circuit 5 includes four independent outputs, which are controlled by the main control chip U3. The 11th pin of the main control chip U3 is connected to a resistor R18 and then connected to the MOS transistor Q12. The 12th pin is connected to a resistor R19 and then connected to the MOS transistor Q11. The 13th pin is connected to a resistor R20 and then connected to the MOS transistor Q10. The 14th pin is connected to a resistor R21 and then connected to the MOS transistor Q9. The resistors R17, R16, R23, R22 are the pull-down resistors of the MOS transistors, which improve the control accuracy of the MCU main control circuit 3.

[0018] In specific implementation, the circuit consists of five functional modules in total: USB charging circuit 1, high-voltage generation circuit 2, MCU main control circuit 4, sound rhythm circuit 3, and flowing water output control circuit 5. The USB charging circuit manages the charging and discharging of a 3.7V polymer lithium battery, boosts the voltage output by the 3.7V polymer lithium battery to 5V, and provides a constant output; the charging interface uses a common type-c interface; pins B9 and A9 are connected as the positive electrode for access, with a 1.5Ω resistor R30 and a 2.2UF capacitor C13 at the back end to filter out the clutter from the input power supply and connect to pin 6 of the charge and discharge management chip U4. Pins A5 and B5 are respectively connected to a 5.1k resistor R1 and a resistor R2 and grounded; the model of chip U4 is the dedicated charge and discharge management chip TP4333; pins 7 and 8 of U4 are respectively connected to an LED indicator to remind of the battery level during the charging and discharging process; LED1 is externally connected to an indicator LED. During charging, LED1 flashes at a frequency of 1Hz, and LED1 stays on constantly after the battery is fully charged; LED2 is externally connected to an indicator LED. LED2 stays on constantly during the discharging process. When the battery voltage is lower than 3.0V, LED2 will flash at a frequency of 1HZ to give a low-voltage alarm reminder.

[0019] High-voltage generation circuit: The main control chip U3 outputs periodic high and low levels to drive U5, U6, U7, and U8. U5 and U6 form a periodic switching circuit that converts the input 5V DC power into 5V AC; to prevent power short-circuit during the AC conversion process, U5 is an NPN type and U6 is a PNP type to ensure that one of U5 and U6 is in the open state when the main control chip outputs high and low levels, preventing short-circuit; the principles of U7 and U8 are the same; L6 is an autotransformer with a turns ratio of 1:20, that is, the AC voltage is boosted by 20 times, boosting the 5V AC power into 100V high-voltage AC power, and the frequency of the high-voltage AC is controlled by the high and low level frequencies of the main control chip driving U5, U6, U7, and U8.

[0020] The MCU main control circuit is the core of the entire circuit control. Pin 5 of the main control chip U3 is connected to the positive electrode of the 5V power supply, pin 7 is connected to the negative electrode of the power supply, and pin 10 is connected to the first pin of the switch SW1. The other pin of SW1 is grounded. Pressing the switch SW1 turns on the entire circuit; when SW1 is pressed, the main control chip enters the working state, and pin 18 outputs a high level to turn on the MOS transistor Q13 to start the entire working circuit.

[0021] The sound rhythm circuit collects the rhythm of external music to control the high-voltage output of multiple channels, forming a rhythmic effect; the positive pole of MIC1 is connected to the 4.7K resistor R7, inputting a 3.7V voltage and paralleling a 1μF capacitor, and then accessing the NPN transistor Q15 to amplify the sound signal collected by MIC1. The high and low level signals are transmitted to the transistor Q14. Q14 will amplify the signal again due to the change of high and low levels and transmit the signal to the main control chip U3. The main control chip U3 outputs a rhythmic light change according to the change of high and low levels.

[0022] The flowing water output control circuit sets four independent outputs, which are controlled by the output of the main control chip U3. The high level is output from the 11th, 12th, 13th, and 14th pins of U3 to turn on the Q12, Q11, Q10, and Q9 MOS transistors to control the high-voltage output; R17, R16, R23, and R22 are the pull-down resistors of the MOS transistors to improve the control accuracy of the MCU main control circuit.

[0023] The above embodiments of the present invention are only examples clearly illustrating the present invention, but do not limit the protection scope of the present invention. All equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention shall be defined by each claim.

Claims

1. A cold light film driving circuit with controllable output frequency, characterized in that: The USB charging circuit (1) comprises a USB charging circuit (1), a high voltage generating circuit (2), an MCU main control circuit (4), a sound rhythm circuit (3), and a stream output control circuit (5). The USB charging circuit (1) comprises a charging interface TYPE-C, wherein the B9 and A9 pins of the charging interface TYPE-C are connected to the positive electrode connected to the 6th pin of the charge and discharge management chip U4, the back end of the circuit is connected to a resistor R30 and a capacitor C13, the A5 pin of the charging interface TYPE-C is connected to a resistor R1 and then to ground, the B5 pin is connected to a resistor R2 and then to ground, the 7th pin of the charge and discharge management chip U4 is connected to a resistor R28 and an LED 1 and then to ground, the 8th pin is connected to a resistor R29 and an LED 2 and then to ground, the 4th pin is connected to the negative electrode of the lithium battery, the 3rd pin is connected to an inductor L5 and a capacitor C11 and then to ground, and the 1st pin is connected to the high voltage generating circuit (2); The high voltage generating circuit (2) comprises transistors U5, U6, U7 and U8. The bases of the transistors U5 and U6 are connected to the 20th pin of the main control chip U3 via resistor R35, and the emitters are connected to the FET Q16 via resistor R31. The bases of the transistors U7 and U8 are connected to the 19th pin of the main control chip U3 via resistor R36, and the emitters are connected to the FET Q17 via resistor R33. The FETs Q16 and Q17 are respectively connected to a transformer L6, and the transformer L6 is connected to a pipeline output control circuit (5). The MCU main control circuit (4) comprises a main control chip U3, wherein pin 5 of the main control chip U3 is connected to the positive electrode of a 5V power supply, pin 7 is connected to the negative electrode of the power supply, pin 10 is connected to pin 1 of a switch SW1, pin 2 of the switch SW1 is grounded, and pin 18 of the main control chip U3 is connected to a resistor R26 and then to a MOS tube Q13.

2. The EL driving circuit with controllable output frequency according to claim 1, characterized in that: The sound rhythm circuit (3) comprises MIC1, the positive electrode of MIC1 is connected to capacitor C5 and then connected to transistor Q15, resistors R7 and R6 are connected in series and then connected in parallel with capacitor C5, the transistor Q15 is connected to transistor Q14, and the transistor Q14 is connected to resistor R25 and then connected to the second pin of the main control chip U3.

3. The EL drive circuit with controllable output frequency according to claim 1, characterized in that: The pipeline output control circuit (5) comprises four independent outputs, which are controlled by the output of the main control chip U3. Pin 11 of the main control chip U3 is connected to a resistor R18 and then to a MOS tube Q12. Pin 12 is connected to a resistor R19 and then to a MOS tube Q11. Pin 13 is connected to a resistor R20 and then to a MOS tube Q10. Pin 14 is connected to a resistor R21 and then to a MOS tube Q9. Resistors R17, R16, R23 and R22 are pull-down resistors of the MOS tubes, thereby improving the control accuracy of the MCU main control circuit.

Images