CN-224233568-U - Power supply circuit and disinfection box

CN224233568UCN 224233568 UCN224233568 UCN 224233568UCN-224233568-U

Abstract

The utility model discloses a power supply circuit and a disinfection box, wherein the power supply circuit comprises a resonance circuit, a first switch circuit and a second switch circuit, the resonance circuit is connected with the input end of the first switch circuit and the input end of the second switch circuit respectively, the output end of the first switch circuit and the output end of the second switch circuit are grounded, the controlled end of the first switch circuit and the controlled end of the second switch circuit are connected with direct current, a transformer is used for transforming a primary winding of the transformer into a current, the first end of the primary winding of the transformer is connected with the controlled end of the first switch circuit, the second end of the primary winding of the transformer is connected with the controlled end of the second switch circuit, and the secondary winding of the transformer is electrically connected with an ultraviolet lamp.

Inventors

YE WENJIE
ZHENG CHUANZHOU
LI DONGBAO

Assignees

深圳瑞圣特电子科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250414

Claims (7)

1. A power supply circuit for a sterilization case, the sterilization case comprising an ultraviolet lamp, the power supply circuit comprising: The resonant circuit is connected with direct current; The resonant circuit is also respectively connected with the input end of the first switch circuit and the input end of the second switch circuit, the output end of the first switch circuit and the output end of the second switch circuit are grounded, and the controlled end of the first switch circuit is connected with the controlled end of the second switch circuit and is connected with direct current; The primary winding of the transformer is mutually transformed with the resonant circuit, the first end of the primary winding of the transformer is connected with the controlled end of the first switch circuit, the second end of the primary winding of the transformer is connected with the controlled end of the second switch circuit, and the secondary winding of the transformer is electrically connected with the ultraviolet lamp.
2. The power supply circuit of claim 1, wherein the resonant circuit comprises: The first end of the first inductor and the first end of the first capacitor are connected with the input end of the first switch circuit, the second end of the first inductor is connected with the first end of the second inductor, and the second end of the first capacitor and the second end of the second inductor are connected with the input end of the second switch circuit; wherein the first inductor and the second inductor are mutually inductive with a primary winding of the transformer.
3. The power supply circuit of claim 1, wherein the first switching circuit comprises: the input end of the first switch tube is connected with the resonant circuit, the controlled end of the first switch tube is connected with the first end of the first resistor, the second end of the first resistor is connected with direct current, and the output end of the first switch tube is grounded; the second switching circuit includes: The input end of the second switching tube is connected with the resonant circuit, the controlled end of the second switching tube is connected with the second end of the second resistor, the first end of the second resistor is connected with direct current and the controlled end of the first switching tube, and the output end of the second switching tube is grounded.
4. A power supply circuit according to any one of claims 1 to 3, wherein the power supply circuit further comprises: The input end of the third switch circuit is respectively connected with the output end of the first switch circuit and the output end of the second switch circuit, the output end of the third switch circuit is grounded, and the main controller is electrically connected with the controlled end of the third switch circuit.
5. The power supply circuit of claim 4, wherein the third switching circuit comprises: The input end of the third switching tube is respectively connected with the output end of the first switching circuit and the output end of the second switching circuit, and the output end of the third switching tube is grounded; The second end of the third resistor and the first end of the fourth resistor are connected with the controlled end of the third switch tube, the first end of the third resistor is electrically connected with the main controller, and the second end of the fourth resistor is grounded.
6. A power supply circuit according to any one of claims 1 to 3, wherein the power supply circuit further comprises: And a plurality of capacitors, wherein the capacitors are arranged in series in a path between the ultraviolet lamp and the secondary winding of the transformer.
7. A sterilizing compartment comprising an ultraviolet lamp and a power supply circuit as claimed in any one of claims 1 to 6, wherein the ultraviolet lamp is electrically connected to the power supply circuit.

Description

Power supply circuit and disinfection box Technical Field The utility model relates to the technical field of disinfection, in particular to a power supply circuit and a disinfection box. Background Ultraviolet lamps (such as low-pressure mercury lamps, LED ultraviolet lamps, etc.) are widely used in the fields of sterilization, photochemical reactions, ultraviolet curing, etc. Ultraviolet lamps generally require stable ac power supply driving, and in recent years, with the development of microcontroller technology and power electronics technology, an inverter circuit based on a main controller is becoming a mainstream scheme of ac power supply for ultraviolet lamps. In a main controller based inverter circuit, the main controller generates an alternating current in the primary winding of a transformer by precisely controlling the alternating conduction of at least two switching tubes (e.g., MOSFETs or IGBTs) so as to induce a desired alternating voltage in the secondary winding. However, the inverter circuit based on the main controller still has some defects in practical application, especially in terms of resource occupation. For example, each switching tube needs a separate IO port for control, which can cause the IO resources of the main controller to be largely occupied, and occupying multiple IO ports can limit the function expansion capability of the main controller, so that the main controller can hardly realize more functions. Disclosure of utility model The utility model mainly aims to provide a power supply circuit and a disinfection box, and aims to solve the technical problem that the existing power supply for supplying power to an ultraviolet lamp occupies more IO port resources. In order to achieve the above object, the present utility model provides a power supply circuit applied to a sterilization box, the sterilization box including an ultraviolet lamp, the power supply circuit including: The resonant circuit is connected with direct current; The resonant circuit is also respectively connected with the input end of the first switch circuit and the input end of the second switch circuit, the output end of the first switch circuit and the output end of the second switch circuit are grounded, and the controlled end of the first switch circuit is connected with the controlled end of the second switch circuit and is connected with direct current; The primary winding of the transformer is mutually transformed with the resonant circuit, the first end of the primary winding of the transformer is connected with the controlled end of the first switch circuit, the second end of the primary winding of the transformer is connected with the controlled end of the second switch circuit, and the secondary winding of the transformer is electrically connected with the ultraviolet lamp. In one embodiment, the resonant circuit includes: The first end of the first inductor and the first end of the first capacitor are connected with the input end of the first switch circuit, the second end of the first inductor is connected with the first end of the second inductor, and the second end of the first capacitor and the second end of the second inductor are connected with the input end of the second switch circuit; wherein the first inductor and the second inductor are mutually inductive with a primary winding of the transformer. In one embodiment, the first switching circuit includes: the input end of the first switch tube is connected with the resonant circuit, the controlled end of the first switch tube is connected with the first end of the first resistor, the second end of the first resistor is connected with direct current, and the output end of the first switch tube is grounded; the second switching circuit includes: The input end of the second switching tube is connected with the resonant circuit, the controlled end of the second switching tube is connected with the second end of the second resistor, the first end of the second resistor is connected with direct current and the controlled end of the first switching tube, and the output end of the second switching tube is grounded. In an embodiment, the power supply circuit further includes: The input end of the third switch circuit is respectively connected with the output end of the first switch circuit and the output end of the second switch circuit, the output end of the third switch circuit is grounded, and the main controller is electrically connected with the controlled end of the third switch circuit. In one embodiment, the third switching circuit includes: The input end of the third switching tube is respectively connected with the output end of the first switching circuit and the output end of the second switching circuit, and the output end of the third switching tube is grounded; The second end of the third resistor and the first end of the fourth resistor are connected with the controlled end of the third switch tube, the first end of the third re