Power supply circuit and disinfection box
By combining resonant and switching circuits, and utilizing parameter differences and the reverse characteristics of resonant current, AC power generation without the need for a main controller is achieved. This solves the problem of excessive I/O port usage by the main controller and enhances functional expansion capabilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN RISUN TECHNOLOGY CO LTD
- Filing Date
- 2025-04-14
- Publication Date
- 2026-05-12
AI Technical Summary
Existing inverter circuits based on the main controller consume a large number of I/O port resources when powering ultraviolet lamps, which limits the functional expansion capabilities of the main controller.
By employing a combination of a resonant circuit, first and second switching circuits, and a transformer, and utilizing the parameter differences of the switching circuits and the natural reverse characteristics of the resonant current, alternating conduction of the switching circuits is achieved to generate alternating current without the need for a main controller.
It reduces the occupation of the main controller's I/O ports, improves the functional expansion capability, and generates AC power through a self-excited oscillation push-pull topology to drive the ultraviolet lamp.
Smart Images
Figure CN224233568U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of disinfection technology, and in particular to a power supply circuit and a disinfection box. Background Technology
[0002] Ultraviolet (UV) lamps (such as low-pressure mercury lamps and LED UV lamps) are widely used in sterilization, photochemical reactions, and UV curing. UV lamps typically require a stable AC power supply. In recent years, with the development of microcontroller and power electronics technologies, inverter circuits based on master controllers have gradually become the mainstream AC power supply solution for UV lamps. In a master controller-based inverter circuit, the master controller precisely controls the alternating conduction of at least two switching transistors (such as MOSFETs or IGBTs) to generate alternating current in the primary winding of the transformer, thereby inducing the required AC voltage in the secondary winding.
[0003] However, inverter circuits based on the main controller still have some shortcomings in practical applications, especially in terms of resource consumption. For example, each switching transistor requires an independent I / O port for control, which leads to a large amount of I / O resources being occupied by the main controller. Occupying multiple I / O ports will limit the functional expansion capability of the main controller, making it difficult for the main controller to implement more functions. Utility Model Content
[0004] The main purpose of this invention is to propose a power supply circuit and a disinfection box, which aims to solve the technical problem that existing power supplies used to power ultraviolet lamps occupy a lot of I / O port resources.
[0005] To achieve the above objectives, this utility model proposes a power supply circuit for use in a disinfection box, the disinfection box including an ultraviolet lamp, and the power supply circuit comprising:
[0006] A resonant circuit, wherein the resonant circuit is connected to a direct current;
[0007] The first switching circuit and the second switching circuit, the resonant circuit are also connected to the input terminals of the first switching circuit and the second switching circuit respectively, the output terminals of the first switching circuit and the second switching circuit are both grounded, the controlled terminal of the first switching circuit and the controlled terminal of the second switching circuit are connected and both are connected to DC power;
[0008] A transformer, wherein the primary winding of the transformer is mutually inducted with the resonant circuit, the first end of the primary winding of the transformer is connected to the controlled end of the first switching circuit, the second end of the primary winding of the transformer is connected to the controlled end of the second switching circuit, and the secondary winding of the transformer is electrically connected to the ultraviolet lamp.
[0009] In one embodiment, the resonant circuit includes:
[0010] A first inductor, a second inductor, and a first capacitor, wherein the first end of the first inductor and the first end of the first capacitor are both connected to the input terminal of the first switching circuit, the second end of the first inductor is connected to the first end of the second inductor, and the second end of the first capacitor and the second end of the second inductor are both connected to the input terminal of the second switching circuit.
[0011] The first inductor and the second inductor are mutually inducted with the primary winding of the transformer.
[0012] In one embodiment, the first switching circuit includes:
[0013] A first switching transistor and a first resistor are connected. The input terminal of the first switching transistor is connected to the resonant circuit, the controlled terminal of the first switching transistor is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to DC power, and the output terminal of the first switching transistor is grounded.
[0014] The second switching circuit includes:
[0015] The second switch and the second resistor are connected. The input terminal of the second switch is connected to the resonant circuit. The controlled terminal of the second switch is connected to the second terminal of the second resistor. The first terminal of the second resistor is connected to DC power and is connected to the controlled terminal of the first switch. The output terminal of the second switch is grounded.
[0016] In one embodiment, the power supply circuit further includes:
[0017] The main controller and the third switching circuit are provided. The input terminal of the third switching circuit is connected to the output terminal of the first switching circuit and the output terminal of the second switching circuit, respectively. The output terminal of the third switching circuit is grounded. The main controller is electrically connected to the controlled terminal of the third switching circuit.
[0018] In one embodiment, the third switching circuit includes:
[0019] The circuit comprises a third switch, a third resistor, and a fourth resistor. The input terminal of the third switch is connected to the output terminal of the first switch circuit and the output terminal of the second switch circuit, respectively, and the output terminal of the third switch is grounded.
[0020] The second end of the third resistor and the first end of the fourth resistor are both connected to the controlled end of the third switch transistor. The first end of the third resistor is electrically connected to the main controller, and the second end of the fourth resistor is grounded.
[0021] In one embodiment, the power supply circuit further includes:
[0022] Multiple capacitors are connected in series in the path between the ultraviolet lamp and the secondary winding of the transformer.
[0023] This utility model also proposes a disinfection box, including an ultraviolet lamp and a power supply circuit as described in any of the above claims; wherein the ultraviolet lamp is electrically connected to the power supply circuit.
[0024] This utility model's power supply circuit includes a resonant circuit, a first switching circuit, a second switching circuit, and a transformer. Due to differences in parameters between the first and second switching circuits, their conduction voltage thresholds differ. Therefore, when DC power is applied, one of the first and second switching circuits will conduct earlier. Assuming the first switching circuit conducts first, the current in the resonant circuit flows to ground through the first switching circuit, forming a positive current path. Because of the mutual inductance between the resonant circuit and the primary winding, a current is generated in the primary winding. At this time, the first terminal of the primary winding has positive polarity, and the second terminal has negative polarity.
[0025] As the current naturally decays and reverses in the resonant circuit, the polarity of the primary winding reverses, causing the controlled terminal voltage of the first switching circuit to decrease and the controlled terminal voltage of the second switching circuit to increase. At this time, the second switching circuit is turned on, and the current in the resonant circuit flows to ground through the second switching circuit, forming a reverse current path.
[0026] As the current naturally decays and reverses in the resonant circuit, the polarity of the primary winding reverses again, causing the first switching circuit to conduct and the second switching circuit to turn off. With this configuration, through the feedback effect of the transformer's primary winding and the natural reversal characteristic of the resonant current, the first and second switching circuits alternately conduct, causing the polarity of the primary winding to alternately reverse, i.e., the current direction on the primary winding to alternately reverse, thus forming alternating current. The alternating current on the primary winding generates alternating current on the secondary winding through mutual inductance, driving the ultraviolet lamp.
[0027] Compared to existing inverter circuits based on a main controller, this invention utilizes a self-excited oscillation push-pull topology and the natural reverse characteristics of transformer feedback and resonant current to achieve alternating conduction of the first and second switching circuits. This allows AC power to be generated without the need for a main controller, which is beneficial for improving the functional expansion capabilities of the main controller. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of a module according to an embodiment of the present invention;
[0030] Figure 2 This is a schematic diagram of the circuit structure of an embodiment of the present invention;
[0031] Figure 3 This is a schematic diagram of the circuit structure of another embodiment of the present invention;
[0032] Figure 4 This is a schematic diagram of the circuit structure of another embodiment of the present invention;
[0033] Figure 5 This is a schematic diagram of the circuit structure of another embodiment of the present invention.
[0034] Explanation of icon numbers:
[0035] 10. Ultraviolet lamp; 20. Resonant circuit; 30. First switching circuit; 40. Second switching circuit; 50. Transformer; 60. Main controller; 70. Third switching circuit.
[0036] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0038] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0039] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0040] Ultraviolet (UV) lamps (such as low-pressure mercury lamps and LED UV lamps) are widely used in sterilization, photochemical reactions, and UV curing. UV lamps typically require a stable AC power supply. In recent years, with the development of microcontroller and power electronics technologies, inverter circuits based on master controllers have gradually become the mainstream AC power supply solution for UV lamps. In a master controller-based inverter circuit, the master controller precisely controls the alternating conduction of two switching transistors (such as MOSFETs or IGBTs) to generate alternating current in the primary winding of the transformer, thereby inducing the required AC voltage in the secondary winding.
[0041] However, inverter circuits based on the main controller still have some shortcomings in practical applications, especially in terms of resource consumption. For example, each switching transistor requires an independent I / O port for control, which leads to a large amount of I / O resources being occupied by the main controller. Occupying multiple I / O ports will limit the functional expansion capability of the main controller, making it difficult for the main controller to implement more functions.
[0042] Therefore, this utility model proposes a power supply circuit and a disinfection box, aiming to solve the technical problem that existing power supplies used to power ultraviolet lamps occupy a large number of I / O port resources. In one embodiment of this utility model, refer to... Figure 1 The power supply circuit includes:
[0043] Resonant circuit 20, wherein the resonant circuit 20 is connected to DC power;
[0044] The first switching circuit 30 and the second switching circuit 40, the resonant circuit 20 are also connected to the input terminals of the first switching circuit 30 and the second switching circuit 40 respectively, the output terminals of the first switching circuit 30 and the second switching circuit 40 are both grounded, the controlled terminal of the first switching circuit 30 is connected to the controlled terminal of the second switching circuit 40, and both are connected to DC power.
[0045] The transformer 50 has a primary winding that is mutually inducted with the resonant circuit 20. The first end of the primary winding of the transformer 50 is connected to the controlled end of the first switching circuit 30, and the second end of the primary winding of the transformer 50 is connected to the controlled end of the second switching circuit 40. The secondary winding of the transformer 50 is electrically connected to the ultraviolet lamp 10.
[0046] In this embodiment, both the first switching circuit 30 and the second switching circuit 40 can be implemented using at least one switching transistor, such as a MOSFET, IGBT, thyristor, transistor, power transistor, etc., and / or using at least one switching device, such as a contactor, circuit breaker, and relay. For example, see reference... Figure 2 The first switching circuit 30 includes a first switching transistor Q1 and a first resistor R1, and the second switching circuit 40 includes a second switching transistor Q2 and a second resistor R2. Both the first switching transistor Q1 and the second switching transistor Q2 are NPN transistors.
[0047] It should be noted that due to slight fluctuations in process factors such as materials, doping concentration, and photolithography precision during the production of the first switch Q1 and the second switch Q2, there is a difference in the conduction voltage threshold of the first switch Q1 and the second switch Q2. Therefore, when the DC power is just turned on, one of the first switch Q1 and the second switch Q2 will turn on earlier.
[0048] In this embodiment, the resonant circuit 20 can be implemented using an inductor circuit and a capacitor circuit. The inductor circuit is mutually inducted with the primary winding of the transformer 50, for example, referring to... Figure 2 The resonant circuit 20 includes:
[0049] The circuit consists of a first inductor L1, a second inductor L2, and a first capacitor C1. The first end of the first inductor L1 and the first end of the first capacitor C1 are both connected to the input terminal of the first switching circuit 30. The second end of the first inductor L1 is connected to the first end of the second inductor L2. The second end of the first capacitor C1 and the second end of the second inductor L2 are both connected to the input terminal of the second switching circuit 40.
[0050] The first inductor L1 and the second inductor L2 are mutually inducted with the primary winding of the transformer 50.
[0051] Assuming the first switching circuit 30 is turned on first, the DC current flows to the ground through the first inductor L1 in the direction of the first switching circuit 30, forming a positive current path. At this time, the first inductor L1 is charging. Since the first inductor L1 is mutually inducted with the primary winding, a current is generated on the primary winding. At this time, the polarity of the first terminal of the primary winding is positive and the polarity of the second terminal is negative.
[0052] As the first inductor L1 and the first capacitor C1 are fully charged, the first inductor L1 discharges through the second inductor L2 to the second switching circuit 40. At this time, the polarity of the primary winding is reversed (the first terminal is negative, and the second terminal is positive), so that the first switching circuit 30 is turned off and the second switching circuit 40 is turned on. The DC current flows to ground through the second inductor L2 and the second switching circuit 40. At this time, the second inductor L2 is charging.
[0053] After the second inductor L2 is fully charged, it discharges through the first inductor L1 to the first switching circuit 30, causing the polarity of the primary winding to reverse again, and the first switching circuit 30 to conduct again. With this configuration, through the feedback effect of the primary winding and the natural reversal characteristic of the resonant current, the first switching circuit 30 and the second switching circuit 40 alternately conduct, causing the polarity of the primary winding to reverse alternately, that is, the current direction on the primary winding to reverse alternately, thus forming alternating current. The alternating current on the primary winding generates alternating current on the secondary winding through mutual inductance, thereby driving the ultraviolet lamp 10.
[0054] This utility model's power supply circuit includes a resonant circuit 20, a first switching circuit 30, a second switching circuit 40, and a transformer 50. Due to differences in parameters between the first switching circuit 30 and the second switching circuit 40, their conduction voltage thresholds differ. Therefore, when DC power is applied, one of the first switching circuit 30 or the second switching circuit 40 will conduct earlier. Assuming the first switching circuit 30 conducts first, the current in the resonant circuit 20 flows to ground through the first switching circuit 30, forming a positive current path. Because the resonant circuit 20 is mutually inducted with the primary winding, a current is generated in the primary winding. At this time, the first terminal of the primary winding has a positive polarity, and the second terminal has a negative polarity.
[0055] As the current naturally decays and reverses in the resonant circuit 20, the polarity of the primary winding reverses (the first terminal of the primary winding is negative and the second terminal is positive), so that the controlled terminal voltage of the first switching circuit 30 decreases and the controlled terminal voltage of the second switching circuit 40 increases. At this time, the second switching circuit 40 is turned on, and the current in the resonant circuit 20 flows to ground through the second switching circuit 40, forming a reverse current path.
[0056] As the current naturally decays and reverses in the resonant circuit 20, the polarity of the primary winding reverses again, causing the first switching circuit 30 to conduct and the second switching circuit 40 to turn off. With this configuration, through the feedback effect of the primary winding of the transformer 50 and the natural reversal characteristic of the resonant current, the first switching circuit 30 and the second switching circuit 40 alternately conduct, causing the polarity of the primary winding to alternately reverse, i.e., the current direction on the primary winding to alternately reverse, thus forming alternating current. The alternating current on the primary winding generates alternating current on the secondary winding through mutual inductance, driving the ultraviolet lamp 10 to operate.
[0057] Compared to existing inverter circuits based on the main controller 60, this invention utilizes a self-excited oscillation push-pull topology and the natural reverse characteristics of the feedback and resonant current of the transformer 50 to achieve alternating conduction of the first switching circuit 30 and the second switching circuit 40. This allows AC power to be generated without the control of the main controller 60, which is beneficial for expanding the functional expansion capabilities of the main controller 60.
[0058] It should be noted that when the disinfection box is not in use, the UV lamp 10 may continue to work, but this will consume more unnecessary power and shorten the battery life of the disinfection box.
[0059] In one embodiment of this utility model, reference is made to Figure 3 The power supply circuit further includes:
[0060] The main controller 60 and the third switching circuit 70 are provided. The input terminal of the third switching circuit 70 is connected to the output terminal of the first switching circuit 30 and the output terminal of the second switching circuit 40, respectively. The output terminal of the third switching circuit 70 is grounded. The main controller 60 is electrically connected to the controlled terminal of the third switching circuit 70.
[0061] In this embodiment, the main controller 60 can be implemented using MCU (Microcontroller Unit), DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc.
[0062] In this embodiment, the third switching circuit 70 can be implemented using at least one switching transistor, such as a MOSFET, IGBT, thyristor, transistor, power transistor, etc., and / or using at least one switching device, such as a contactor, circuit breaker, and relay. For example, see reference... Figure 4 The third switching circuit 70 includes:
[0063] The third switch Q3, the third resistor R3, and the fourth resistor R4 are provided. The input terminal of the third switch Q3 is connected to the output terminal of the first switch circuit 40 and the output terminal of the second switch circuit 50, respectively, and the output terminal of the third switch Q3 is grounded.
[0064] The second end of the third resistor R3 and the first end of the fourth resistor R4 are both connected to the controlled terminal of the third switch Q3. The first end of the third resistor R3 is electrically connected to the main controller 60, and the second end of the fourth resistor R4 is grounded. The third switch Q3 is an NMOS transistor.
[0065] In this embodiment, when the main controller 60 controls the third switching circuit 70 to be turned on, direct current can flow to ground through the resonant circuit 20 and the first switching circuit 30 / second switching circuit 40, so that the primary winding induces alternating current to the secondary winding to power the ultraviolet lamp 10. When the main controller 60 controls the third switching circuit 70 to be turned off, direct current cannot flow to ground through the resonant circuit 20 and the first switching circuit 30 / second switching circuit 40, thus stopping the power supply to the ultraviolet lamp 10.
[0066] With this configuration, in practical applications, when the disinfection box is in standby mode, the main controller 60 controls the third switch circuit 70 to turn off, thereby cutting off the power supply circuit to the ultraviolet lamp 10 and reducing the static power consumption of the disinfection box. When the user needs to disinfect and triggers the disinfection box to work via a button or external signal, the main controller 60 controls the third switch circuit 70 to turn on, thereby restoring the power supply to the ultraviolet lamp 10.
[0067] Furthermore, compared to the existing inverter circuit based on the main controller 60, which requires multiple I / O ports, the third switch circuit 70 in this embodiment only requires one I / O port to control the start and stop of the disinfection box, thus reducing the occupation of I / O ports.
[0068] In one embodiment of this utility model, reference is made to Figure 5 The power supply circuit further includes:
[0069] Multiple capacitors are connected in series in the path between the ultraviolet lamp 10 and the secondary winding of the transformer 50.
[0070] In this embodiment, the impedance of the ultraviolet lamp 10 varies significantly at different operating stages (start-up and steady state). Multiple capacitors can dynamically adjust the total impedance of the circuit to ensure maximum power is transferred to the lamp. Furthermore, when the ultraviolet lamp 10 is turned off or the load changes abruptly, the charge stored in the capacitors can temporarily maintain the energy supply and prevent drastic current fluctuations.
[0071] This utility model also proposes a disinfection box, including an ultraviolet lamp 10 and a power supply circuit as described above; wherein the ultraviolet lamp 10 is electrically connected to the power supply circuit.
[0072] It is worth noting that since the disinfection box of this utility model is based on the above-mentioned power supply circuit, the embodiments of the disinfection box of this utility model include all the technical solutions of all the embodiments of the above-mentioned power supply circuit, and the technical effects achieved are exactly the same, so they will not be repeated here.
[0073] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A power supply circuit applied to a disinfection box, the disinfection box including an ultraviolet lamp, characterized in that, The power supply circuit includes: A resonant circuit, wherein the resonant circuit is connected to a direct current; The first switching circuit and the second switching circuit, the resonant circuit are also connected to the input terminals of the first switching circuit and the second switching circuit respectively, the output terminals of the first switching circuit and the second switching circuit are both grounded, the controlled terminal of the first switching circuit and the controlled terminal of the second switching circuit are connected and both are connected to DC power; A transformer, wherein the primary winding of the transformer is mutually inducted with the resonant circuit, the first end of the primary winding of the transformer is connected to the controlled end of the first switching circuit, the second end of the primary winding of the transformer is connected to the controlled end of the second switching circuit, and the secondary winding of the transformer is electrically connected to the ultraviolet lamp.
2. The power supply circuit as described in claim 1, characterized in that, The resonant circuit includes: A first inductor, a second inductor, and a first capacitor, wherein the first end of the first inductor and the first end of the first capacitor are both connected to the input terminal of the first switching circuit, the second end of the first inductor is connected to the first end of the second inductor, and the second end of the first capacitor and the second end of the second inductor are both connected to the input terminal of the second switching circuit. The first inductor and the second inductor are mutually inducted with the primary winding of the transformer.
3. The power supply circuit as described in claim 1, characterized in that, The first switching circuit includes: A first switching transistor and a first resistor are connected. The input terminal of the first switching transistor is connected to the resonant circuit, the controlled terminal of the first switching transistor is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to DC power, and the output terminal of the first switching transistor is grounded. The second switching circuit includes: The second switch and the second resistor are connected. The input terminal of the second switch is connected to the resonant circuit. The controlled terminal of the second switch is connected to the second terminal of the second resistor. The first terminal of the second resistor is connected to DC power and is connected to the controlled terminal of the first switch. The output terminal of the second switch is grounded.
4. The power supply circuit as described in any one of claims 1 to 3, characterized in that, The power supply circuit also includes: The main controller and the third switching circuit are provided. The input terminal of the third switching circuit is connected to the output terminal of the first switching circuit and the output terminal of the second switching circuit, respectively. The output terminal of the third switching circuit is grounded. The main controller is electrically connected to the controlled terminal of the third switching circuit.
5. The power supply circuit as described in claim 4, characterized in that, The third switching circuit includes: The circuit comprises a third switch, a third resistor, and a fourth resistor. The input terminal of the third switch is connected to the output terminal of the first switch circuit and the output terminal of the second switch circuit, respectively, and the output terminal of the third switch is grounded. The second end of the third resistor and the first end of the fourth resistor are both connected to the controlled end of the third switch transistor. The first end of the third resistor is electrically connected to the main controller, and the second end of the fourth resistor is grounded.
6. The power supply circuit as described in any one of claims 1 to 3, characterized in that, The power supply circuit also includes: Multiple capacitors are connected in series in the path between the ultraviolet lamp and the secondary winding of the transformer.
7. A disinfection box, characterized in that, It includes an ultraviolet lamp and a power supply circuit as described in any one of claims 1 to 6; wherein the ultraviolet lamp is electrically connected to the power supply circuit.