Driving system of ultraviolet germicidal lamp

Abstract

The utility model relates to the technical field of electronic control technology, in particular to a driving system of an ultraviolet germicidal lamp, which comprises a control circuit, a UVC LED circuit and a fan, an input end of the control circuit is connected with a direct-current power supply, two output ends of the control circuit are respectively connected with the UVC LED circuit and the fan, stable voltage is output through a chip U1 and is supplied to a chip U2, and the chip U2 is connected with the UVC LED circuit. Resistors R19, R21, R24 and R25 on the chip U2 are used for setting the current of the UVC LED circuit; meanwhile, stable voltage is output to supply power to the chip U5, and the output end of the chip U5 is connected to a fan. According to the driving system, the MCU circuit controls the lightening time of the ultraviolet germicidal lamp, the LDO voltage stabilizing circuit protects the driving system and outputs stable voltage, the current of the UVC LED circuit is set through four resistors of the chip U2, it is guaranteed that the ultraviolet germicidal lamp is not prone to damage and long in service life, the fan and the ultraviolet germicidal lamp work at the same time through the chip U5, and the service life of the ultraviolet germicidal lamp is prolonged. And the air can flow and be disinfected, man-machine coexistence can be achieved, and the vehicle-mounted air purifier can be used.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic control technology, in particular to a driving system for an ultraviolet germicidal lamp. Background Art

[0002] At present, there are generally the following two ways to drive an ultraviolet germicidal lamp: (1) Use a mercury-containing ultraviolet lamp tube. After inputting 220V alternating current, the lighting time is adjusted mechanically; the drive uses a triode and an inductor to form a half-bridge inverter circuit to light the germicidal lamp tube; (2) Use a mercury-containing ultraviolet lamp tube, input direct current of 12V or 24V, and use a triode and an inductor to form an inverter circuit to light the germicidal lamp tube. Generally, the input interface of an ultraviolet germicidal lamp is a USB interface, and the voltage of the USB interface is 5V. If the input voltage is alternating current of 220V, an inverter is needed to light it. If the input is direct current of 12V, a level converter is also needed. The lighting time of the ultraviolet germicidal lamp is adjusted by a mechanical timer. The mechanical timer is relatively large in size, easy to break and has a short lifespan. In addition, the drive circuit needs to have a protection function. If the light source is damaged, the drive circuit will also be burned out; and the light source is visible to the naked eye, and the light source irradiation will cause harm to the human body. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is: to overcome the deficiencies in the prior art and provide a driving system for an ultraviolet germicidal lamp.

[0004] The technical solution adopted by the utility model to solve its technical problem is: a driving system for an ultraviolet germicidal lamp, the driving system includes a control circuit, a UVC LED circuit and a fan. The control circuit includes a chip U1, a chip U2, a chip U5, an MCU circuit, an LDO voltage stabilization circuit and a detection circuit. The 11th pin of the chip UI outputs a stable voltage for powering the chip U2 and the chip U5. The two ends of the UVC LED circuit are respectively connected to the 20th pin and the 16th pin of the chip U2. The 6th pin of the chip U5 is connected to the fan. The input end of the LDO voltage stabilization circuit is connected to a DC power supply, and its output end outputs a stable 5V for powering the MCU circuit and the detection circuit. The MCU circuit includes a chip U4. The 8th pin of the chip U4 is connected to the 4th pin of the chip U2. The 7th pin of the chip U4 is connected to the 7th pin, the 8th pin, the 9th pin and the 10th pin of the chip U5. The 13th pin, the 14th pin and the 15th pin of the chip U4 are respectively connected to the indicator lights LED9, LED8 and LED7.

[0005] Further, the model of the chip U1 is TPS552892, the model of the chip U2 is TPS92624, the model of the chip U4 is S9KEAZN8AMTG, and the model of the chip U5 is TPS1HB16B.

[0006] Further, the second, third, fourth, and fifth pins of the chip U2 are respectively connected to resistors R19, R21, R24, and R25 to set the current of the UVC LED circuit.

[0007] Further, the 15th pin of the chip U4 is sequentially connected to the resistor R36, the indicator LED7, and then connected to the +5V DC power supply. The 14th pin of the chip U4 is sequentially connected to the resistor R38, the indicator LED8, and then connected to the +5V DC power supply. The 13th pin of the chip U4 is sequentially connected to the resistor R40, the indicator LED9, and then connected to the +5V DC power supply.

[0008] Further, the 11th pin of the chip U4 is connected to the resistor R41 and then connected to the 14th pin of the chip U5. The 10th pin of the chip U4 is connected to the resistor R24 and then connected to the 3rd pin of the chip U5. The 9th pin of the chip U4 is connected to the resistor R34 and then connected to the 2nd pin of the chip U5. One end of the resistor R34 is connected to the capacitor C41 and then grounded, and the other end of the resistor is connected to the resistor R37 and then grounded.

[0009] Further, it further includes a connector J1. The first pin of the connector J1 is connected to the 16th pin of the chip U4. The second pin of the connector J1 is grounded. The third pin of the connector J1 is connected to the 2nd pin of the chip U4. The fourth pin of the connector J1 is connected to the first ground pin of the chip U4. The fifth ground pin of the connector J1 is connected to the +5V DC power supply.

[0010] Further, the 7th pin of the chip U4 is connected to one end of the resistor R44, and the other end of the resistor R44 is connected to the 4th pin of the chip U5. A resistor R45 is also connected to the 4th pin of the chip U5, and one end of the resistor R45 is grounded.

[0011] Further, the detection circuit includes a triode Q2 and a tactile switch K1. The collector of the triode Q2 is connected to one end of the resistor R23, the other end of the resistor R23 is connected to the +5V DC power supply. A resistor R30 and a capacitor C30 are connected in parallel between the base and the emitter of the triode Q2. A resistor R29, a diode D3, and a tactile switch K1 are also connected to the base of the triode Q2, and the other end of the tactile switch K1 is connected to the +5V DC power supply.

[0012] Further, the collector of the triode Q2 is connected to the 6th ground pin of the chip U4.

[0013] Further, the LDO voltage stabilizing circuit includes a chip U3, the model of the chip U3 is TPS7B6950, the input terminal of the 1st pin of the chip U3, the 2nd pin is grounded, the 3rd pin is the output terminal, a capacitor C32 is connected between the input terminal of the chip U3 and the ground wire, and a capacitor C31 and a capacitor C33 are connected in parallel between the output terminal of the chip U3 and the ground wire.

[0014] The beneficial effects of the present utility model are as follows: The drive system of the present utility model controls the lighting time of the ultraviolet germicidal lamp through the MCU circuit, protects the drive system through the LDO voltage stabilizing circuit, outputs a stable voltage, sets the current of the UVC LED circuit through four resistors of the chip U2, ensures that the ultraviolet germicidal lamp is not easily damaged and has a long service life, and enables the fan and the ultraviolet germicidal lamp to work simultaneously through the chip U5, so that the air flows and is disinfected, achieving coexistence of humans and machines and being applicable to vehicles. Description of the Drawings

[0015] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0016] Figure 1 is the control block diagram of the present utility model.

[0017] Figure 2 is the circuit diagram of the present utility model.

[0018] Figure 3 is Figure 2 the circuit diagrams of the chips U1, U2, and U5 in

[0019] Figure 4 is the circuit diagram of the MCU circuit in the present utility model.

[0020] Figure 5 is the circuit diagram of the LDO voltage stabilizing circuit in the present utility model.

[0021] Figure 6 is the circuit diagram of the detection circuit in the present utility model.

[0022] Figure 7 is the circuit diagram of the UVC LED circuit in the present utility model.

[0023] In the figure: 100. Control circuit, 1. DC power supply, 2. UVC LED circuit, 3. Fan, 4. MCU circuit, 5. LDO voltage stabilizing circuit, 6. Detection circuit. Detailed Embodiments

[0024] The present utility model will now be further described in conjunction with the drawings. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0025] Such asFigure 1 As shown in the figure, a driving system for an ultraviolet germicidal lamp, the driving system includes a control circuit 100, a UVC LED circuit 2 and a fan 3. The input end of the control circuit 100 is connected to a DC power supply 1, and its two output ends are respectively connected to the UVC LED circuit 2 and the fan 3.

[0026] As Figure 2 and Figure 3 shown in the figure, the control circuit 100 includes a chip U1, a chip U2, a chip U5, an MCU circuit 4, an LDO voltage stabilizing circuit 5 and a detection circuit 6. The 11th pin of the chip UI outputs a stable voltage for powering the chip U2 and the chip U5. The two ends of the UVC LED circuit 2 are respectively connected to the 20th pin and the 16th pin of the chip U2. The 6th pin of the chip U5 is connected to the fan 3. The input end of the LDO voltage stabilizing circuit 5 is connected to the DC power supply 1, and its output end outputs a stable 5V for powering the MCU circuit 4 and the detection circuit 6. The 2nd pin, the 3rd pin, the 4th pin and the 5th pin of the chip U2 are respectively connected to resistors R19, R21, R24 and R25 to set the current of the UVC LED circuit 2. The MCU circuit 4 includes a chip U4. The 8th pin of the chip U4 is connected to the 4th pin of the chip U2. The 7th pin of the chip U4 is connected to the 7th pin, the 8th pin, the 9th pin and the 10th pin of the chip U5. The 13th pin, the 14th pin and the 15th pin of the chip U4 are respectively connected to indicator lights LED9, LED8 and LED7.

[0027] In this embodiment, the model of the chip U1 is TPS552892, the model of the chip U2 is TPS92624, the model of the chip U4 is S9KEAZN8AMTG, and the model of the chip U5 is TPS1HB16B.

[0028] As Figure 4 shown in the figure, the 15th pin of the chip U4 is sequentially connected to a resistor R36, an indicator light LED7 and then to the +5V DC power supply. The 14th pin of the chip U4 is sequentially connected to a resistor R38, an indicator light LED8 and then to the +5V DC power supply. The 13th pin of the chip U4 is sequentially connected to a resistor R40, an indicator light LED9 and then to the +5V DC power supply. Combining Figure 1 , the 11th pin of the chip U4 is connected to a resistor R41 and then connected to the 14th pin of the chip U5. The 10th pin of the chip U4 is connected to a resistor R24 and then connected to the 3rd pin of the chip U5. The 9th pin of the chip U4 is connected to a resistor R34 and then connected to the 2nd pin of the chip U5. One end of the resistor R34 is connected to a capacitor C41 and then grounded, and the other end of the resistor is connected to a resistor R37 and then grounded. The 7th pin of the chip U4 is connected to one end of a resistor R44, and the other end of the resistor R44 is connected to the 4th pin of the chip U5. A resistor R46 is also connected to the 4th pin of the chip U5, and one end of the resistor R46 is grounded.

[0029] It also includes a connector J1. The first pin of the connector J1 is connected to the 16th pin of the chip U4, the second pin of the connector J1 is grounded, the third pin of the connector J1 is connected to the 2nd pin of the chip U4, the fourth pin of the connector J1 is connected to the 1st ground pin of the chip U4, and the 5th ground pin of the connector J1 is connected to the +5V DC power supply.

[0030] Such as Figure 5 As shown, the LDO voltage regulator circuit 5 includes a chip U3. The model of the chip U3 is TPS7B6950. The first pin of the chip U3 is the input terminal, the second pin is grounded, the third pin is the output terminal. A capacitor C32 is connected between the input terminal of the chip U3 and the ground wire, and a capacitor C31 and a capacitor C33 are connected in parallel between the output terminal of the chip U3 and the ground wire.

[0031] Such as Figure 6 As shown, the detection circuit 6 includes a triode Q2 and a momentary switch K1. The collector of the triode Q2 is connected to one end of a resistor R23. The other end of the resistor R23 is connected to the +5V DC power supply. A resistor R30 and a capacitor C30 are connected in parallel between the base and the emitter of the triode Q2. A resistor R29, a diode D3 and a momentary switch K1 are also connected to the base of the triode Q2. The other end of the momentary switch K1 is connected to the +5V DC power supply. The collector of the triode Q2 is connected to the 6th ground pin of the chip U4.

[0032] Such as Figure 7 As shown, the UVC LED circuit 2 is composed of two UVC LED lamp strings connected in parallel. 4 UVC LED lamps are respectively connected in series on 2 branches. Each UVC LED lamp is connected in parallel with a capacitor to protect the UVC LED lamp.

[0033] Specific driving process:

[0034] After being powered by the DC power supply VCC, when the momentary switch K1 is pressed for the first time, the chip U4's PTB6 (the 6th pin) detects a low level, the chip U4's PTB4 (the 8th pin) outputs a high level to the enable pin EN (the 4th pin) of the chip U5. At the same time, the chip U4's PTB5 (the 5th pin) outputs a high level to the PWM pins (the 7th, 8th, 9th, 10th pins) of the chip U2. The UVC LED lamps on the UVC LED circuit 2 and the fan 3 work, and the indicator LED7 lights up. After the UVC LED lamps, the fan and the indicator LED7 work for 30 minutes, they stop working;

[0035] When the touch switch K1 is pressed for the second time, the PTB6 (pin 6) of the chip U4 detects a low level, the PTB4 (pin 8) of the chip U4 outputs a high level to the enable pin EN (pin 4) of the chip U5. At the same time, the PTB5 (pin 5) of the chip U4 outputs a high level to the PWM pins (pins 7, 8, 9, 10) of the chip U2. The UVC LED lights and the fan on the UVC LED circuit 2 work, and the indicator LED8 lights up. After the UVC LED lights, the fan and the indicator LED8 work for 60 minutes, they stop working;

[0036] When the touch switch K1 is pressed for the third time, the PTB6 (pin 6) of the chip U4 detects a low level, the PTB4 (pin 8) of the chip U4 outputs a high level to the enable pin EN (pin 4) of the chip U5. At the same time, the PTB5 (pin 5) of the chip U4 outputs a high level to the PWM pins (pins 7, 8, 9, 10) of the chip U2. The UVC LED lights D and the fan 3 on the UVC LE circuit 2 work, and the indicator LED8 lights up. After the UVC LED lights, the fan and the indicator LED9 work for 90 minutes, they stop working;

[0037] When the touch switch K1 is pressed for the fourth time, the UVC LED lights, the fan 3 and the indicator LEDs LED9, LED8 and LED7 all stop working.

[0038] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A driving system for an ultraviolet germicidal lamp, characterized in that: The driving system comprises a control circuit (100), a UVC LED circuit (2) and a fan (3), wherein the control circuit (100) comprises a chip U1, a chip U2, a chip U5, an MCU circuit (4), an LDO voltage regulator circuit (5) and a detection circuit (6), wherein the 11th pin of the chip U1 outputs a stable voltage for supplying power to the chip U2 and the chip U5, and the UVC The two ends of the LED circuit (2) are respectively connected to the 20th and 16th pins of the chip U2, the 6th pin of the chip U5 is connected to the fan, the input end of the LDO voltage regulator circuit (5) is connected to a DC power supply, and the output end thereof outputs a stable 5V for powering the MCU circuit (4) and the detection circuit (6), the MCU circuit (4) comprises a chip U4, the 8th pin of the chip U4 is connected to the 4th pin of the chip U2, the 7th pin of the chip U4 is connected to the 7th pin, the 8th pin, the 9th pin and the 10th pin of the chip U5, and the 13th pin, the 14th pin and the 15th pin of the chip U4 are respectively connected to the indicator lights LED9, LED8 and LED7.

2. The driving system of the ultraviolet germicidal lamp according to claim 1, characterized in that: The model of the chip U1 is TPS552892, the model of the chip U2 is TPS92624, the model of the chip U4 is S9KEAZN8AMTG, and the model of the chip U5 is TPS1HB16B.

3. The driving system of the ultraviolet germicidal lamp according to claim 2, characterized in that: Pin 2, pin 3, pin 4 and pin 5 of the chip U2 are respectively connected to resistors R19, R21, R24 and R25 to set the current of the UVC LED circuit (2).

4. The driving system of the ultraviolet germicidal lamp according to claim 2, characterized in that: Pin 15 of the chip U4 is connected in sequence to resistor R36, indicator light LED7 and then to a +5V DC power supply, pin 14 of the chip U4 is connected in sequence to resistor R38, indicator light LED8 and then to a +5V DC power supply, and pin 13 of the chip U4 is connected in sequence to resistor R40, indicator light LED9 and then to a +5V DC power supply.

5. The driving system of the ultraviolet germicidal lamp according to claim 2, characterized in that: Pin No. 11 of the chip U4 is connected to resistor R41 and then to pin No. 14 of the chip U5, pin No. 10 of the chip U4 is connected to resistor R24 ​​and then to pin No. 3 of the chip U5, pin No. 9 of the chip U4 is connected to resistor R34 and then to pin No. 2 of the chip U5, and one end of the resistor R34 is connected to capacitor C41 and then to ground, and the other end of the resistor is connected to resistor R37 and then to ground.

6. The driving system of the ultraviolet germicidal lamp according to claim 2, characterized in that: It also includes a connector J1, wherein pin 1 of the connector J1 is connected to pin 16 of the chip U4, pin 2 of the connector J1 is connected to the ground wire, pin 3 of the connector J1 is connected to pin 2 of the chip U4, pins 1 and 2 of the connector J1 are connected to ground pin 1 of the chip U4, and ground pin 5 of the connector J1 is connected to a +5V DC power supply.

7. The driving system of the ultraviolet germicidal lamp according to claim 2, characterized in that: Pin No. 7 of the chip U4 is connected to one end of a resistor R44, and the other end of the resistor R44 is connected to pin No. 4 of the chip U5. A resistor R46 is also connected to pin No. 4 of the chip U5, and one end of the resistor R46 is grounded.

8. The driving system of the ultraviolet germicidal lamp according to claim 7, characterized in that: The detection circuit includes a transistor Q2 and a touch switch K1, the collector of the transistor Q2 is connected to one end of a resistor R23, the other end of the resistor R23 is connected to a +5V DC power supply, a resistor R30 and a capacitor C30 are connected in parallel between the base and the emitter of the transistor Q2, a resistor R29, a diode D3 and a touch switch K1 are also connected to the base of the transistor Q2, and the other end of the touch switch K1 is connected to a +5V DC power supply.

9. The driving system of the ultraviolet germicidal lamp according to claim 8, characterized in that: The collector of the transistor Q2 is connected to the ground pin 6 of the chip U4.

10. The driving system of the ultraviolet germicidal lamp according to claim 1, characterized in that: The LDO voltage stabilizing circuit (5) comprises a chip U3, the model of the chip U3 is TPS7B6950, the first pin of the chip U3 is an input terminal, the second pin is a ground wire, the third pin is an output terminal, a capacitor C32 is connected between the input terminal of the chip U3 and the ground wire, and capacitors C31 and C33 are connected in parallel between the output terminal of the chip U3 and the ground wire.

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