A driving circuit, a driving device, an electronic device and a kitchenware sterilizing machine

Abstract

The present invention discloses a driving circuit, comprising: a first constant voltage circuit, a sterilization circuit and a first constant current circuit, wherein the input end of the first constant voltage circuit is connected to a power supply, the output end of the first constant voltage circuit is connected to the input end of the sterilization circuit, and the first constant voltage circuit is used to output a constant voltage; the output end of the sterilization circuit is connected to the first input end of the first constant current circuit, and the sterilization circuit is used to emit ultraviolet rays of a preset wavelength; the second input end of the first constant current circuit is connected to the power supply, the output end of the first constant current circuit is grounded, and the first constant current circuit is used to keep the current of the sterilization circuit constant.

Description

Technical Field

[0001] The present invention relates to the field of sterilization and disinfection, and in particular to a driving circuit, a driving device, an electronic device and a kitchenware sterilizer. Background Art

[0002] After the existing ultraviolet germicidal lamp is turned on, the current in the circuit will increase over time (within a certain range), and even if the current limiting resistor is increased, a stable working current cannot be guaranteed. In addition, as the current in the circuit increases, the power consumed also increases. The increased energy is dissipated in the form of heat energy, causing the temperature of the ultraviolet germicidal lamp surface to rise, affecting the sterilization effect. Summary of the invention

[0003] In order to solve the technical problem that the ultraviolet germicidal lamp cannot maintain constant current in the prior art and affects the sterilization effect, the present invention provides a driving circuit, including: a first constant voltage circuit, a sterilization circuit and a first constant current circuit.

[0004] Wherein, the input end of the first constant voltage circuit is connected to a power supply, the output end of the first constant voltage circuit is connected to the input end of the sterilization circuit, and the first constant voltage circuit is used to output a constant voltage;

[0005] The output end of the sterilization circuit is connected to the first input end of the first constant current circuit, and the sterilization circuit is used to emit ultraviolet rays of a preset wavelength;

[0006] The second input end of the first constant current circuit is connected to the power supply, the output end of the first constant current circuit is grounded, and the first constant current circuit is used to keep the current of the sterilization circuit constant.

[0007] In one embodiment, the driving circuit further includes a second constant voltage circuit, an indication circuit and a second constant current circuit.

[0008] The input end of the second constant voltage circuit is connected to the power supply, the first output end of the second constant voltage circuit is connected to the input end of the indication circuit, the second output end of the second constant voltage circuit is grounded, and the second constant voltage circuit is used to output a constant voltage to the indication circuit;

[0009] The output end of the indicating circuit is connected to the first input end of the second constant current circuit, and the indicating circuit is used to indicate the state of the sterilization function;

[0010] The second input end of the second constant current circuit is connected to the power supply, the output end of the second constant current circuit is grounded, and the second constant current circuit is used to keep the current of the indicating circuit constant.

[0011] In one embodiment, the second constant voltage circuit includes a first resistor, a second resistor and an operational amplifier.

[0012] Wherein, one end of the first resistor is connected to the power supply, and the other end of the first resistor is connected to the non-inverting input end of the operational amplifier and one end of the second resistor;

[0013] The other end of the second resistor is grounded;

[0014] The inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the input terminal of the indicating circuit.

[0015] In one embodiment, the indicator circuit includes a first diode and a second diode,

[0016] Wherein, the anode of the first diode is connected to the first output end of the second constant voltage circuit, and the cathode of the first diode is connected to the anode of the second diode;

[0017] A cathode of the second diode is connected to a first input terminal of the second constant current circuit.

[0018] In one embodiment, the second constant current circuit includes a first transistor, a second transistor, a third resistor, a fourth resistor and a fifth resistor.

[0019] Wherein, the collector of the first transistor is connected to the output end of the indicating circuit, the emitter of the first transistor is connected to one end of the third resistor and one end of the fourth resistor, and the base of the first transistor is connected to the collector of the second transistor and one end of the fifth resistor;

[0020] The emitter of the second transistor is grounded, and the base of the second transistor is connected to the other end of the fourth resistor;

[0021] The other end of the third resistor is grounded;

[0022] The other end of the fifth resistor is connected to the power supply.

[0023] In one embodiment, the first constant voltage circuit comprises a sixth resistor,

[0024] One end of the sixth resistor is connected to the power supply, and the other end of the sixth resistor is connected to the input end of the sterilization circuit.

[0025] In one embodiment, the sterilization circuit includes a third diode and a fourth diode,

[0026] Wherein, the anode of the third diode is connected to the output end of the first constant voltage circuit, and the cathode of the third diode is connected to the anode of the fourth diode;

[0027] A cathode of the fourth diode is connected to the first input terminal of the second constant current circuit.

[0028] In one embodiment, the first constant current circuit includes a third transistor, a fourth transistor, a seventh resistor, an eighth resistor and a ninth resistor.

[0029] Wherein, the collector of the third transistor is connected to the output end of the sterilization circuit, the emitter of the third transistor is connected to one end of the seventh resistor and one end of the eighth resistor, and the base of the third transistor is connected to the collector of the fourth transistor and one end of the ninth resistor;

[0030] The emitter of the fourth transistor is grounded, and the base of the fourth transistor is connected to the other end of the eighth resistor;

[0031] The other end of the seventh resistor is grounded;

[0032] The other end of the ninth resistor is connected to the power supply.

[0033] An embodiment of the present invention further provides a driving device, comprising the driving circuit as described above.

[0034] An embodiment of the present invention further provides an electronic device, comprising the driving device as described above.

[0035] An embodiment of the present invention further provides a kitchenware sterilizer, comprising the electronic device as described above.

[0036] Compared with the prior art, one or more embodiments of the above scheme may have the following advantages or beneficial effects:

[0037] The driving circuit provided by the present invention includes a constant voltage circuit, a sterilization circuit and a constant current circuit, which realize constant current driving of the ultraviolet sterilization lamp by series connection, thereby reducing power loss, thereby controlling the temperature rise on the surface of the ultraviolet sterilization lamp within the expected range, and improving the sterilization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. The drawings included are:

[0039] Figure 1 A schematic diagram of a circuit structure of a driving circuit provided by an embodiment of the present invention is shown;

[0040] Figure 2 A schematic diagram of a circuit structure of a driving circuit provided by an embodiment of the present invention is shown;

[0041] Figure 3A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0043] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0044] If similar descriptions of "first / second / third" appear in the application documents, the following description is added. In the following description, the terms "first / second / third" are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understandable that "first / second / third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the invention described herein can be implemented in an order other than that illustrated or described herein.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0046] Based on the problems existing in the related art, an embodiment of the present invention provides a driving circuit, including: a first constant voltage circuit, a sterilization circuit and a first constant current circuit.

[0047] Wherein, the input end of the first constant voltage circuit is connected to a power supply, the output end of the first constant voltage circuit is connected to the input end of the sterilization circuit, and the first constant voltage circuit is used to output a constant voltage;

[0048] The output end of the sterilization circuit is connected to the first input end of the first constant current circuit, and the sterilization circuit is used to emit ultraviolet rays of a preset wavelength;

[0049] The second input end of the first constant current circuit is connected to the power supply, the output end of the first constant current circuit is grounded, and the first constant current circuit is used to keep the current of the sterilization circuit constant.

[0050] The driving circuit provided by the present invention includes a constant voltage circuit, a sterilization circuit and a constant current circuit, which realize constant current driving of the ultraviolet sterilization lamp by series connection, thereby reducing power loss, thereby controlling the temperature rise on the surface of the ultraviolet sterilization lamp within the expected range, and improving the sterilization effect.

[0051] In one embodiment, the driving circuit further includes a second constant voltage circuit, an indication circuit and a second constant current circuit.

[0052] The input end of the second constant voltage circuit is connected to the power supply, the first output end of the second constant voltage circuit is connected to the input end of the indication circuit, the second output end of the second constant voltage circuit is grounded, and the second constant voltage circuit is used to output a constant voltage to the indication circuit;

[0053] The output end of the indicating circuit is connected to the first input end of the second constant current circuit, and the indicating circuit is used to indicate the state of the sterilization function;

[0054] The second input end of the second constant current circuit is connected to the power supply, the output end of the second constant current circuit is grounded, and the second constant current circuit is used to keep the current of the indicating circuit constant.

[0055] The driving circuit provided by the present invention includes a constant voltage circuit, a sterilization circuit and a constant current circuit. Constant current driving of the ultraviolet sterilization lamp is achieved by series connection, thereby reducing power loss, thereby controlling the temperature rise on the surface of the ultraviolet sterilization lamp within the expected range. At the same time, an indication circuit for indicating the status of the sterilization function is provided, thereby further improving the sterilization effect.

[0056] Figure 1 FIG. 1 is a schematic diagram of a driving circuit according to an embodiment of the present invention. In one embodiment, as shown in the figure, the second constant voltage circuit includes a first resistor R 1 , the second resistor R 2 and operational amplifier U 1 .

[0057] Among them, the first resistor R 1 One end of the first resistor R 1 The other end is connected to the operational amplifier U 1 The non-inverting input terminal and the second resistor R 2 one end of

[0058] The second resistor R 2 The other end is grounded;

[0059] The operational amplifier U 1 The inverting input terminal of the operational amplifier U 1 The output terminal of the operational amplifier U 1The output end of the indicator circuit is connected to the input end of the indicator circuit.

[0060] It can be seen that the second resistor R 2 The other end of the operational amplifier U is the second output end of the second constant voltage circuit. 1 The output end of is the first output end of the second constant voltage circuit.

[0061] Specifically, the power supply can be a DC power supply with a voltage of 12V, R 1 can be 470Ω, R 2 It can be 1000Ω, U 1 It can form a common-phase proportional device with the first resistor and the second resistor to reduce the voltage to twice the UVA operating voltage. The corresponding proportional coefficient is as follows:

[0062]

[0063] The voltage U at the first output terminal of the second constant voltage circuit obtained by setting the above parameters is out The stable voltage is about 8V.

[0064] like Figure 1 As shown, in one embodiment, the indicating circuit includes a first diode D 1 and the second diode D 2 .

[0065] Wherein, the first diode D 1 The positive electrode of the first diode D is connected to the first output end of the second constant voltage circuit. 1 The cathode of the second diode D is connected 2 The positive electrode;

[0066] The second diode D 2 The negative electrode is connected to the first input terminal of the second constant current circuit.

[0067] Specifically, D 1 and D 2 A long-wave diode may be used to serve as an indicator, and specifically a diode with a UVA wavelength of approximately 400 nm may be used.

[0068] like Figure 1 As shown, in one embodiment, the second constant current circuit includes a first transistor Q 1 、The second transistor Q 2 , the third resistor R 3 , the fourth resistor R 4 and the fifth resistor R 5 ,

[0069] Wherein, the first transistor Q 1The collector of the first transistor Q is connected to the output end of the indicating circuit. 1 The emitter of the third resistor R 3 one end and the fourth resistor R 4 One end of the first transistor Q 1 The base of the second transistor Q 2 The collector and the fifth resistor R 5 one end of

[0070] The second transistor Q 2 The emitter of the second transistor Q is grounded. 2 The base of the fourth resistor R 4 The other end of

[0071] The third resistor R 3 The other end is grounded;

[0072] The fifth resistor R 5 The other end is connected to the power supply.

[0073] Specifically, R 3 It can be 12Ω, R 4 It can be 100Ω, R 5 It can be 1000Ω. out After voltage, Q 1 The base is connected to the 12V power supply, Q 1 When the R 3 The voltage reaches 7V, that is, it flows through R 3 The current I R3 =0.7 / 12=58mA, Q 2 The base voltage reaches 0.7V, Q 2 At this time, Q 1 The base voltage of Q 1 Cut off, no current flows through R 3 , so Q 2 There is no voltage on the base, Q 2 At this time, Q 1 The base is released, Q 1 Turn it on again, and a constant current of 58mA can be obtained through this cycle.

[0074] Through the above-described arrangement, the embodiment of the present invention only requires two transistors to be arranged to be cyclically conducted, thereby achieving constant current, a simple circuit and low cost.

[0075] Figure 2 FIG. 1 is a schematic diagram of a driving circuit according to an embodiment of the present invention. In one embodiment, the first constant voltage circuit includes a sixth resistor R6 ,

[0076] Wherein, the sixth resistor R 6 One end of the sixth resistor R 6 The other end is connected to the input end of the sterilization circuit.

[0077] Specifically, R 6 It can be 22Ω.

[0078] like Figure 2 As shown, in one embodiment, the sterilization circuit includes a third diode D 3 and the fourth diode D 4 ,

[0079] Wherein, the third diode D 3 The positive electrode of the third diode D 3 The cathode of the diode is connected to the anode of the fourth diode;

[0080] The fourth diode D 4 The negative electrode is connected to the first input terminal of the second constant current circuit.

[0081] Specifically, D 3 and D 4 Short-wave diodes can be used to achieve sterilization. Specifically, diodes with a UVC wavelength of around 280nm can be used, with a stable working voltage of 5-8V and a working current of 40mA. Because a 12V power supply can achieve D 3 and D 4 Stable operation, so the above series R 6 The voltage can be stabilized by this method.

[0082] like Figure 2 As shown, in one embodiment, the first constant current circuit includes a third transistor Q 3 、The fourth transistor Q 4 , the seventh resistor R 7 , the eighth resistor R 8 and the ninth resistor R 9 ,

[0083] Wherein, the third transistor Q 3 The collector of the third transistor Q is connected to the output end of the sterilization circuit. 3 The emitter of the seventh resistor R 7 one end and the eighth resistor R 8 One end of the third transistor Q 3 The base of the fourth transistor Q 4 The collector and the ninth resistor R 9one end of

[0084] The fourth transistor Q 4 The emitter of the fourth transistor Q is grounded. 4 The base of the eighth resistor R 8 The other end of

[0085] The seventh resistor R 7 The other end is grounded;

[0086] The ninth resistor R 9 The other end is connected to the power supply.

[0087] Specifically, R 7 It can be 18Ω, R 8 It can be 100Ω, R 9 It can be 1000Ω. The output end of the sterilization circuit, that is, the fourth diode D 4 The negative electrode is connected to the first constant current circuit, so that R 7 The voltage reaches 0.7V and flows through R 7 The current I R7 =0.7 / 18=38mA. Thus, the total current flowing through the drive circuit is about 100mA, the total voltage is 12V, and the total power is 1.2W.

[0088] Therefore, the driving circuit provided by the present invention includes a constant voltage circuit, a sterilization circuit and a constant current circuit, which realize constant current driving of the ultraviolet sterilization lamp by series connection, thereby reducing power loss, thereby controlling the temperature rise on the surface of the ultraviolet sterilization lamp within the expected range, and improving the sterilization effect.

[0089] The embodiment of the present invention further provides a driving device, comprising the driving circuit as described above. Specifically, the device may be an ultraviolet germicidal lamp device.

[0090] An embodiment of the present invention further provides an electronic device, comprising the driving device as described above. Figure 3 The following is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. Figure 3 As shown, the electronic device 600 includes: a processor 601 , at least one communication bus 602 , a user interface 603 , at least one external communication interface 604 , and a memory 605 .

[0091] The communication bus 602 may be configured to implement connection and communication between these components.

[0092] The user interface 603 may include a display screen, and the external communication interface 604 may include a standard wired interface and a wireless interface. The processor 601 is configured to execute the program of the control method stored in the memory to implement the steps of the control method provided in the above embodiment.

[0093] The embodiment of the present invention further provides a kitchenware sterilizer, comprising the electronic device as described above. Specifically, the kitchenware sterilizer may be a knife and cutting board sterilizer.

[0094] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted for facilitating the understanding of the present invention and are not intended to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present invention, but the protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A driving circuit, It is characterized in that include: a first constant voltage circuit, a sterilization circuit and a first constant current circuit, Wherein, the input end of the first constant voltage circuit is connected to a power supply, the output end of the first constant voltage circuit is connected to the input end of the sterilization circuit, and the first constant voltage circuit is used to output a constant voltage; The output end of the sterilization circuit is connected to the first input end of the first constant current circuit, and the sterilization circuit is used to emit ultraviolet rays of a preset wavelength; The second input end of the first constant current circuit is connected to the power supply, the output end of the first constant current circuit is grounded, and the first constant current circuit is used to keep the current of the sterilization circuit constant; The driving circuit also includes a second constant voltage circuit, an indication circuit and a second constant current circuit. The input end of the second constant voltage circuit is connected to the power supply, the first output end of the second constant voltage circuit is connected to the input end of the indication circuit, the second output end of the second constant voltage circuit is grounded, and the second constant voltage circuit is used to output a constant voltage to the indication circuit; The output end of the indicating circuit is connected to the first input end of the second constant current circuit, and the indicating circuit is used to indicate the state of the sterilization function; The second input end of the second constant current circuit is connected to the power supply, the output end of the second constant current circuit is grounded, and the second constant current circuit is used to keep the current of the indicating circuit constant; The indicating circuit comprises a first diode and a second diode, wherein the anode of the first diode is connected to the first output end of the second constant voltage circuit, the cathode of the first diode is connected to the anode of the second diode; the cathode of the second diode is connected to the first input end of the second constant current circuit; the first diode and the second diode are both UVA diodes; The second constant voltage circuit includes a first resistor, a second resistor and an operational amplifier. Wherein, one end of the first resistor is connected to the power supply, and the other end of the first resistor is connected to the non-inverting input end of the operational amplifier and one end of the second resistor; The other end of the second resistor is grounded; The inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the input terminal of the indication circuit; The other end of the second resistor is the second output end of the second constant voltage circuit, and the output end of the operational amplifier is the first output end of the second constant voltage circuit; the operational amplifier, the first resistor and the second resistor form a common-phase proportional device to reduce the power supply input voltage to twice the operating voltage of the UVA diode.

2. The driving circuit according to claim 1, It is characterized in that The second constant current circuit includes a first triode, a second triode, a third resistor, a fourth resistor and a fifth resistor. Wherein, the collector of the first transistor is connected to the output end of the indicating circuit, the emitter of the first transistor is connected to one end of the third resistor and one end of the fourth resistor, and the base of the first transistor is connected to the collector of the second transistor and one end of the fifth resistor; The emitter of the second transistor is grounded, and the base of the second transistor is connected to the other end of the fourth resistor; The other end of the third resistor is grounded; The other end of the fifth resistor is connected to the power supply.

3. The driving circuit according to claim 1, It is characterized in that The first constant voltage circuit includes a sixth resistor, One end of the sixth resistor is connected to the power supply, and the other end of the sixth resistor is connected to the input end of the sterilization circuit.

4. The driving circuit according to claim 1, It is characterized in that The sterilization circuit includes a third diode and a fourth diode, Wherein, the anode of the third diode is connected to the output end of the first constant voltage circuit, and the cathode of the third diode is connected to the anode of the fourth diode; A cathode of the fourth diode is connected to the first input terminal of the second constant current circuit.

5. The driving circuit according to claim 1, It is characterized in that The first constant current circuit includes a third transistor, a fourth transistor, a seventh resistor, an eighth resistor and a ninth resistor. Wherein, the collector of the third transistor is connected to the output end of the sterilization circuit, the emitter of the third transistor is connected to one end of the seventh resistor and one end of the eighth resistor, and the base of the third transistor is connected to the collector of the fourth transistor and one end of the ninth resistor; The emitter of the fourth transistor is grounded, and the base of the fourth transistor is connected to the other end of the eighth resistor; The other end of the seventh resistor is grounded; The other end of the ninth resistor is connected to the power supply.

6. A driving device, It is characterized in that The driving circuit comprises the driving circuit according to any one of claims 1 to 5.

7. An electronic device, It is characterized in that Comprising the driving device as claimed in claim 6.

8. A kitchenware sterilizer, It is characterized in that An electronic device comprising the electronic device described in claim 7.

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