A driving circuit of ultraviolet sterilization lamp and air conditioner

Abstract

The application discloses a driving circuit of an ultraviolet sterilization lamp and an air conditioner. The air conditioner comprises a main control board, and the driving circuit of the ultraviolet sterilization lamp comprises a control module, a first voltage boosting module, a rectifier bridge and a second voltage boosting module. The control module is used for connecting a control signal output by the main control board. The first voltage boosting module is used for connecting an input voltage and boosting the input voltage according to the control signal. The second voltage boosting module is used for boosting an output voltage after rectification processing of the rectifier bridge, so as to drive the ultraviolet sterilization lamp to output ultraviolet rays of a corresponding wave band. The application can effectively alleviate the problem that kitchen air conditioners accumulate oil stains and breed bacteria, and thus cause safety hazards in the kitchen environment.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a driving circuit for an ultraviolet germicidal lamp and an air conditioner. Background Technology

[0002] Currently, kitchen air conditioners are mainly used to lower the kitchen temperature during cooking, providing a comfortable environment for users. However, kitchen environments typically contain high concentrations of cooking fumes. In such environments, the air conditioner's filters and internal components easily accumulate large amounts of grease and grease residue. This accumulation of grease and grease residue can breed bacteria, posing certain safety hazards to the kitchen environment.

[0003] Therefore, the technology still needs to be improved and enhanced. Utility Model Content

[0004] This application provides a driving circuit for an ultraviolet germicidal lamp and an air conditioner, which can alleviate the problem of food safety hazards caused by the accumulation of oil and bacteria in kitchen air conditioners.

[0005] This application provides a driving circuit for an ultraviolet germicidal lamp, applied in an air conditioner. The air conditioner includes a main control board, and the driving circuit for the ultraviolet germicidal lamp includes:

[0006] A first boost module is connected to the control module. The first boost module is used to receive the input voltage and boost the input voltage according to the control signal.

[0007] A rectifier bridge is used to rectify the voltage output by the first boost module;

[0008] The second boost module is connected to the rectifier bridge and the ultraviolet germicidal lamp. The second boost module is used to boost the output voltage after rectification by the rectifier bridge to drive the ultraviolet germicidal lamp to output ultraviolet light of the corresponding wavelength.

[0009] In some embodiments of the driving circuit for a UV germicidal lamp, the driving circuit further includes a third boost module, which is connected to the first boost module;

[0010] The third boost module is used to connect to the power supply voltage of the main control board, and the third boost module is used to boost the power supply voltage to provide the input voltage to the first boost module.

[0011] In some embodiments of the driving circuit for an ultraviolet germicidal lamp, the third boost module includes an input filter unit, a boost unit, and an output filter unit connected in sequence, and the output filter unit is also connected to the first boost module;

[0012] The input filtering unit is used to receive the power supply voltage and filter the power supply voltage; the boost unit is used to boost the filtered power supply voltage; the output filtering unit is used to filter the voltage output by the boost unit and provide the input voltage to the first boost module.

[0013] In some embodiments of the driving circuit of the ultraviolet germicidal lamp, the input filtering unit includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; one end of the first capacitor, one end of the second capacitor, one end of the third capacitor, and one end of the fourth capacitor are all used to connect to the power supply voltage, and the other ends of the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor are all grounded.

[0014] In some embodiments of the driving circuit for an ultraviolet germicidal lamp, the boost unit includes a first inductor, a Zener diode, and a boost chip. One end of the first inductor is connected to one end of a first capacitor, and the other end of the first inductor is connected to pins 7 and 8 of the boost chip. The positive terminal of the Zener diode is connected to the other end of the first inductor, and the negative terminal of the Zener diode is connected to a second boost module. Pins 3, 5, and 6 of the boost chip are also connected to one end of the first capacitor.

[0015] In some embodiments of the driving circuit of the ultraviolet germicidal lamp, the output filtering unit includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor. One end of the fifth capacitor, one end of the sixth capacitor, one end of the seventh capacitor, and one end of the eighth capacitor are all connected to the negative terminal of the Zener diode, and the other ends of the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor are all grounded.

[0016] In some embodiments, the driving circuit of the ultraviolet germicidal lamp includes a control module comprising a ninth capacitor, a diode, a first resistor, a first switching transistor, a second switching transistor, a second resistor, and a tenth capacitor. One end of the ninth capacitor is used to receive a PWM control signal, and the other end of the ninth capacitor is connected to the first end of the first switching transistor. The cathode of the diode and one end of the first resistor are connected to the first end of the first switching transistor. The anode of the diode, the other end of the first resistor, and the second end of the first switching transistor are all grounded. The third end of the first switching transistor and one end of the second resistor are both connected to the first end of the second switching transistor. The other end of the second resistor is connected to the first boost module. The second end of the second switching transistor is grounded. The third end of the second switching transistor is connected to the first boost module. One end of the tenth capacitor is connected to the third end of the second switching transistor, and the other end of the tenth capacitor is grounded.

[0017] In some embodiments of the driving circuit of the ultraviolet germicidal lamp, the first boost module includes a second inductor and a first transformer. One end of the second inductor is used to connect to the input voltage, the other end of the second inductor is connected to the primary winding of the first transformer, and the secondary winding of the first transformer is connected to the rectifier bridge.

[0018] In some embodiments of the driving circuit for an ultraviolet germicidal lamp, the second boost module includes a second transformer, an eleventh capacitor, a twelfth capacitor, a third resistor, a fourth resistor, and a silicon controlled rectifier (SCR) diode. The primary winding of the second transformer is connected to a rectifier bridge. One end of the eleventh capacitor is connected to the primary winding of the second transformer, and the other end of the eleventh capacitor is grounded. The anode of the SCR diode is connected to the rectifier bridge and the secondary winding of the second transformer, and the cathode of the SCR diode is grounded. One end of the third resistor, one end of the fourth resistor, and one end of the twelfth capacitor are all connected to the control terminal of the SCR diode. The other end of the third resistor is connected to the anode of the SCR diode, and the other end of the fourth resistor and the other end of the twelfth capacitor are grounded. The secondary winding of the second transformer is also connected to the ultraviolet germicidal lamp.

[0019] This application also provides an air conditioner, which includes an ultraviolet germicidal lamp and the aforementioned ultraviolet germicidal lamp driving circuit.

[0020] This application provides a driving circuit for an ultraviolet germicidal lamp and an air conditioner. The driving circuit of the ultraviolet germicidal lamp includes a first boost module for boosting the input voltage, and a second boost module for further boosting the voltage output from the first boost module to drive the ultraviolet germicidal lamp to output ultraviolet light of the corresponding wavelength. By using two boost modules to progressively boost the input voltage and output a high voltage, this application achieves the operating voltage required for the ultraviolet germicidal lamp to output ultraviolet light of the corresponding wavelength, thus sterilizing the filter in the kitchen air conditioner and preventing bacterial growth, thereby improving the safety of the kitchen environment. Attached Figure Description

[0021] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 This is a first structural block diagram of the driving circuit for an ultraviolet germicidal lamp provided in an embodiment of this application.

[0023] Figure 2 This is a second structural block diagram of the driving circuit for the ultraviolet germicidal lamp provided in an embodiment of this application.

[0024] Figure 3 This is a structural block diagram of the third boost module in the driving circuit of the ultraviolet germicidal lamp provided in the embodiments of this application.

[0025] Figure 4 The circuit diagram of the third boost module in the driving circuit of the ultraviolet germicidal lamp provided in the embodiment of this application is shown.

[0026] Figure 5 The circuit structure diagram of the first boost module and the second boost module in the driving circuit of the ultraviolet germicidal lamp provided in the embodiment of this application is shown. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features thus defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Please see Figure 1 This application provides a driving circuit for an ultraviolet germicidal lamp, which is applied in an air conditioner. The air conditioner includes a main control board, and the driving circuit for the ultraviolet germicidal lamp includes a control module 100, a first boost module 200, a rectifier bridge 300, and a second boost module 400 connected in sequence. The second boost module 400 is also connected to the ultraviolet germicidal lamp. The control module 100 receives control signals output from the main control board. The first boost module 200 receives an input voltage and boosts the input voltage according to the control signals. The rectifier bridge 300 rectifies the voltage output from the first boost module 200, ensuring a smooth, noise-free power supply for the second boost module 400. The second boost module 400 boosts the output voltage after rectification by the rectifier bridge to drive the ultraviolet germicidal lamp 10 to output ultraviolet light of the corresponding wavelength.

[0030] In this application, two boost modules are set up to gradually increase the input voltage to output a high voltage, which reaches the working voltage required for the ultraviolet germicidal lamp 10. This allows the ultraviolet germicidal lamp 10 to output ultraviolet rays of the corresponding wavelength to sterilize the filter in the kitchen air conditioner, thereby preventing the growth of bacteria and improving the safety of the kitchen environment.

[0031] Please see Figure 2 In some embodiments, the driving circuit further includes a third boost module 500, which is connected to the first boost module 200. The third boost module 500 is used to receive the power supply voltage from the main control board and to boost the power supply voltage to provide the input voltage to the first boost module 200. This is equivalent to the driving circuit having multiple boost modules. The power supply voltage output from the main control board is boosted multiple times through these three boost modules to reach the operating voltage required by the ultraviolet germicidal lamp 10, thereby outputting ultraviolet light of the corresponding wavelength to sterilize the filter in the kitchen air conditioner.

[0032] Please see Figure 3 In some embodiments, the third boost module 500 includes an input filtering unit 510, a boost unit 520, and an output filtering unit 530 connected in sequence. The output filtering unit 530 is also connected to the first boost module 200. The input filtering unit 510 is used to receive a power supply voltage, such as VCC, and filters it. The boost unit 520 is used to boost the filtered power supply voltage. The output filtering unit 530 is used to filter the voltage output by the boost unit 520. In this embodiment, filtering units are provided on both the input and output sides of the boost unit 520. The input filtering unit 510 filters the input power supply voltage, ensuring the smoothness and stability of the voltage input to the boost unit 520. The output filtering unit 530 filters the voltage output by the boost unit 520, ensuring the smoothness and stability of the voltage input to the first boost module 200, such as VOUT, thereby improving the reliability of the drive circuit.

[0033] Please see Figure 4 In one embodiment, the input filtering unit 510 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. One end of each of the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 is connected to a power supply voltage such as VCC. The other ends of each of the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are grounded. In this embodiment, the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 serve as filtering capacitors to filter the power supply voltage of the input drive circuit, ensuring the smoothness and stability of the voltage input to the boost unit 520, thereby improving the reliability of the circuit.

[0034] In one embodiment, the boost unit 520 includes a first inductor L1, a Zener diode ZD1, and a boost chip U1. One end of the first inductor L1 is connected to one end of the first capacitor C1, and the other end of the first inductor L1 is connected to pins 7 and 8 of the boost chip U1. The positive terminal of the Zener diode ZD1 is connected to the other end of the first inductor L1, and the negative terminal of the Zener diode ZD1 is connected to the first boost module 200 (e.g., VOUT terminal in this embodiment). Pins 3, 5, and 6 of the boost chip U1 are also connected to one end of the first capacitor C1. When VCC is connected, the first inductor L1 charges. The switching of the switching transistor inside the boost chip U1 causes the voltage of the first inductor L1 to continuously switch and store energy, thereby increasing the voltage. The Zener diode ZD1, acting as a protection diode D1, prevents the boosted voltage from backflowing and damaging the front-end equipment.

[0035] In one embodiment, the output filtering unit 530 includes a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8. One end of each of the following capacitors is connected to the negative terminal of the Zener diode ZD1: C5, C6, C7, and C8. The other ends of each capacitor are grounded. In this embodiment, the fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, and eighth capacitor C8 serve as filter capacitors to filter the voltage output to the first boost module 200, ensuring the smoothness and stability of the voltage output to the first boost module 200, thereby improving the reliability of the circuit.

[0036] Please see Figure 5 In one embodiment, the control module 100 includes a ninth capacitor C9, a diode D1, a first resistor R1, a first switch Q1, a second switch Q2, a second resistor R2, and a tenth capacitor C10. One end of the ninth capacitor C9 is used to receive a control signal such as a PWM signal, and the other end of the ninth capacitor C9 is connected to the first end of the first switch Q1. The cathode of the diode D1 and one end of the first resistor R1 are connected to the first end of the first switch Q1. The anode of the diode D1, the other end of the first resistor R1, and the second end of the first switch Q1 are all grounded. The third end of the first switch Q1 and one end of the second resistor R2 are both connected to the first end of the second switch Q2. The other end of the second resistor R2 is used to receive an input voltage such as VOUT. The second end of the second switch Q2 is grounded, and the third end of the second switch Q2 is connected to the first boost module 200. One end of the tenth capacitor C10 is connected to the third end of the second switch Q2, and the other end of the tenth capacitor C10 is grounded.

[0037] In this embodiment, the first switching transistor Q1 is a transistor, with its first terminal being the base, its second terminal being the collector, and its third terminal being the emitter. The second switching transistor Q2 is a MOSFET, with its first terminal being the gate, its second terminal being the drain, and its third terminal being the source. The first switching transistor Q1 acts as a driver switch, controlling the switching of the second switching transistor Q2 according to the PWM signal, thereby controlling the first boost module 200 to boost the input voltage, VOUT.

[0038] In one embodiment, the first boost module 200 includes a second inductor L2 and a first transformer T1. One end of the second inductor L2 is connected to the other end of the second resistor R2, and the other end of the second inductor L2 is connected to the primary winding of the first transformer T1. The secondary winding of the first transformer T1 is connected to the rectifier bridge 300. When a PWM control signal of a certain frequency is applied to the base of the transistor to control the switching of the MOSFET, the voltage of the second inductor L2 is superimposed on the voltage of the primary winding of the first transformer T1 through charging. By adjusting the turns ratio of the first transformer T1, the voltage of the primary winding can be adjusted to a high voltage that enables the ultraviolet germicidal lamp 10 to operate. When no PWM signal is input to the base of the transistor, the ultraviolet germicidal lamp 10 is in the off state.

[0039] In one embodiment, the second boost module 400 includes a second transformer T2, an eleventh capacitor C11, a twelfth capacitor C12, a third resistor R3, a fourth resistor R4, and a thyristor diode D2. The primary winding of the second transformer T2 is connected to the rectifier bridge 300. One end of the eleventh capacitor C11 is connected to the primary winding of the second transformer T2, and the other end of the eleventh capacitor C11 is grounded. The anode of the thyristor diode D2 is connected to the rectifier bridge 300 and the secondary winding of the second transformer T2, and the cathode of the thyristor diode D2 is grounded. One end of the third resistor R3, one end of the fourth resistor R4, and one end of the twelfth capacitor C12 are all connected to the control terminal of the thyristor diode D2. The other end of the third resistor R3 is connected to the anode of the thyristor diode D2, and the other end of the fourth resistor R4 is grounded. The other end of the twelfth capacitor C12 is grounded. The secondary winding of the second transformer T2 is also connected to the ultraviolet germicidal lamp 10.

[0040] Among them, the third resistor R3 and the fourth resistor R4 form a voltage divider. When the high voltage output by the rectifier bridge 300, such as HIV_VCC, rises to a certain value, the voltage difference after the voltage divider is formed by the third resistor R3 and the fourth resistor R4 causes the thyristor diode D2 to conduct. After the thyristor diode D2 conducts, it will momentarily turn off because the voltage is pulled down. The switching process of the thyristor diode D2 generates a high voltage induced voltage in the second transformer T2, thereby making the ultraviolet germicidal lamp 10 work.

[0041] Please continue reading. Figure 4 In one embodiment, the driving circuit further includes a fifth resistor and a sixth resistor. One end of the fifth resistor is connected to the negative terminal of the Zener diode ZD1, and the other ends of both the fifth and sixth resistors are connected to pin 4 of the boost chip U1. The other end of the sixth resistor is grounded. In this embodiment, the fifth and sixth resistors act as voltage divider resistors for voltage sampling, and the sampled voltage is output to the boost chip U1 to facilitate voltage feedback, thereby adjusting the output voltage of the first boost module 200, such as VOUT.

[0042] Please continue reading. Figure 5 In one embodiment, the driving circuit further includes a thirteenth capacitor C13. One end of the thirteenth capacitor C13 is connected to the other end of the tenth capacitor C10, and the other end of the thirteenth capacitor C13 is connected to the secondary winding of the first transformer T1. In this embodiment, the thirteenth capacitor C13 is a Y capacitor, which is used to isolate the high voltage of the first transformer T1 from the low voltage section at the front end, thereby providing protection and improving the reliability of the driving circuit.

[0043] This application also provides an air conditioner, which includes an ultraviolet germicidal lamp and the aforementioned driving circuit for the ultraviolet germicidal lamp. Since the driving circuit for the ultraviolet germicidal lamp has been described in detail above, it will not be repeated here.

[0044] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0045] The driving circuit of the ultraviolet germicidal lamp provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solution and core idea of ​​this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A driving circuit for an ultraviolet germicidal lamp, used in an air conditioner, the air conditioner including a main control board, characterized in that, The driving circuit of the ultraviolet germicidal lamp includes: The control module is used to receive the control signals output by the main control board; A first boost module is connected to the control module. The first boost module is used to receive the input voltage and boost the input voltage according to the control signal. A rectifier bridge is used to rectify the voltage output by the first boost module; The second boost module is connected to the rectifier bridge and the ultraviolet germicidal lamp. The second boost module is used to boost the output voltage after rectification by the rectifier bridge to drive the ultraviolet germicidal lamp to output ultraviolet light of the corresponding wavelength.

2. The driving circuit for the ultraviolet germicidal lamp according to claim 1, characterized in that, The driving circuit further includes a third boost module, which is connected to the first boost module. The third boost module is used to connect to the power supply voltage of the main control board, and the third boost module is used to boost the power supply voltage to provide the input voltage to the first boost module.

3. The driving circuit for the ultraviolet germicidal lamp according to claim 2, characterized in that, The third boost module includes an input filter unit, a boost unit, and an output filter unit connected in sequence, and the output filter unit is also connected to the first boost module. The input filtering unit is used to receive the power supply voltage and filter the power supply voltage; the boost unit is used to boost the filtered power supply voltage. The output filtering unit is used to filter the voltage output by the boost unit and then provide the input voltage to the first boost module.

4. The driving circuit for the ultraviolet germicidal lamp according to claim 3, characterized in that, The input filtering unit includes a first capacitor, a second capacitor, a third capacitor, and a fourth capacitor; one end of the first capacitor, one end of the second capacitor, one end of the third capacitor, and one end of the fourth capacitor are all used to connect to the power supply voltage, and the other ends of the first capacitor, the second capacitor, the third capacitor, and the fourth capacitor are all grounded.

5. The driving circuit for the ultraviolet germicidal lamp according to claim 4, characterized in that, The boost unit includes a first inductor, a Zener diode, and a boost chip. One end of the first inductor is connected to one end of the first capacitor, and the other end of the first inductor is connected to pins 7 and 8 of the boost chip. The positive terminal of the Zener diode is connected to the other end of the first inductor, and the negative terminal of the Zener diode is connected to the second boost module. Pins 3, 5, and 6 of the boost chip are also connected to one end of the first capacitor.

6. The driving circuit for the ultraviolet germicidal lamp according to claim 5, characterized in that, The output filtering unit includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor. One end of the fifth capacitor, one end of the sixth capacitor, one end of the seventh capacitor, and one end of the eighth capacitor are all connected to the negative terminal of the Zener diode. The other ends of the fifth capacitor, the sixth capacitor, the seventh capacitor, and the eighth capacitor are all grounded.

7. The driving circuit for the ultraviolet germicidal lamp according to any one of claims 1-6, characterized in that, The control module includes a ninth capacitor, a diode, a first resistor, a first switching transistor, a second switching transistor, a second resistor, and a tenth capacitor. One end of the ninth capacitor is used to receive a PWM control signal, and the other end of the ninth capacitor is connected to the first end of the first switching transistor. The cathode of the diode and one end of the first resistor are connected to the first end of the first switching transistor. The anode of the diode, the other end of the first resistor, and the second end of the first switching transistor are all grounded. The third end of the first switching transistor and one end of the second resistor are both connected to the first end of the second switching transistor. The other end of the second resistor is connected to the first boost module. The second end of the second switching transistor is grounded. The third end of the second switching transistor is connected to the first boost module. One end of the tenth capacitor is connected to the third end of the second switching transistor, and the other end of the tenth capacitor is grounded.

8. The driving circuit for the ultraviolet germicidal lamp according to claim 7, characterized in that, The first boost module includes a second inductor and a first transformer. One end of the second inductor is used to connect to the input voltage, and the other end of the second inductor is connected to the primary winding of the first transformer. The secondary winding of the first transformer is connected to the rectifier bridge.

9. The driving circuit for the ultraviolet germicidal lamp according to claim 8, characterized in that, The second boost module includes a second transformer, an eleventh capacitor, a twelfth capacitor, a third resistor, a fourth resistor, and a silicon controlled rectifier (SCR) diode. The primary winding of the second transformer is connected to the rectifier bridge. One end of the eleventh capacitor is connected to the primary winding of the second transformer, and the other end of the eleventh capacitor is grounded. The anode of the SCR diode is connected to the rectifier bridge and the secondary winding of the second transformer, and the cathode of the SCR diode is grounded. One end of the third resistor, one end of the fourth resistor, and one end of the twelfth capacitor are all connected to the control terminal of the SCR diode. The other end of the third resistor is connected to the anode of the SCR diode, and the other end of the fourth resistor and the other end of the twelfth capacitor are grounded. The secondary winding of the second transformer is also connected to the ultraviolet germicidal lamp.

10. An air conditioner, characterized in that, The air conditioner includes an ultraviolet germicidal lamp and a driving circuit for the ultraviolet germicidal lamp as described in any one of claims 1-9.

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