A dual-purpose drive power supply for a UV lamp

Abstract

The present invention proposes a dual-purpose drive power supply for a UV lamp, which relates to the field of UV power supplies and includes a three-phase rectification module, a low-pass filtering module, a dual-phase interleaved parallel BUCK module, and a full-bridge inversion module. The three-phase rectification module is used to connect to three-phase alternating current and rectify the three-phase alternating current; the low-pass filtering module is connected to the three-phase rectification module and is used to filter out the ripple in the rectified output voltage; the BUCK module is connected to the low-pass filtering module and is used to output a DC voltage to obtain an output effect with a relatively high switching frequency at a relatively low switching frequency; the full-bridge inversion module is connected to the dual-phase interleaved parallel BUCK module and is used to output an AC square wave at a fixed frequency through a full-bridge inversion topology structure for the converted output DC voltage of the dual-phase interleaved parallel BUCK module and provide an ultra-high voltage trigger for the UV mercury lamp. The present invention enables the UV-LED lamp to be seamlessly switched and connected to the AC square wave power supply provided by the drive power supply in the same way as the traditional UV mercury lamp, and solves the drive of LED multi-path constant current at a relatively low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of UV power supplies, and in particular to a dual-purpose drive power supply for UV lamps. Background Art

[0002] In 2020, China will phase out the production and use of mercury-containing batteries and fluorescent lamp products required by the Minamata Convention on Mercury (hereinafter referred to as the "Minamata Convention"). At the same time, the production industry of VCM (vinyl chloride, which generates mercury-containing wastewater) will reduce the usage per unit product by 50% in 2021 (based on 2010), and all primary mercury mines will be shut down by 2032. With the entry into force of the Minamata Convention, primary mercury mines will be comprehensively prohibited around 2030, and there will be no production and supply of primary mercury in the future. Since UV LEDs do not contain mercury, are environmentally friendly and safe, and have the characteristics of fast startup and high efficiency, their market development potential is very large in the future. According to the research report of LEDinside, the market value of the UV LED market grew to $223 million in 2017, and it is estimated to reach $1.224 billion in 2022, with a compound growth rate of 33% from 2017 to 2022. In addition to the stable growth of the curing market, surface sterilization, static water sterilization, and flowing water sterilization are the main growth drivers in the next five years (2018 - 2022).

[0003] In many application fields, UV-LED light sources are gradually being used to replace traditional mercury lamp light sources. A UV-LED is a light-emitting diode, which is more environmentally friendly, efficient, and has low energy consumption compared to traditional UV mercury lamps, and is a truly green industry oriented towards sustainable development.

[0004] However, in the process of promoting the replacement of traditional UV mercury lamps with UV-LEDs, the cost of the overall solution of UV-LEDs has become a major obstacle. Especially in the case where traditional UV mercury lamps have been put into production and use, the drive power supply of traditional UV mercury lamps and related electrical control systems cannot directly drive UV-LED light sources, and the waste of resources caused by the need for manufacturers to upgrade all equipment itself is also an unenvironmentally friendly measure. Currently, high-power UV mercury lamp power supplies on the market all adopt an AC high-voltage drive method, while the characteristics of UV-LED light sources require a low-voltage DC drive method for the drive power supply. Therefore, it is urgent to develop a power supply that meets the different power supply requirements of the two light sources. Summary of the Invention

[0005] To solve the above technical problems, the purpose of the present invention is to provide a dual-purpose drive power supply for UV lamps, which can seamlessly switch and connect a UV mercury lamp or a UV-LED lamp to the drive power supply.

[0006] The specific technical solution adopted by the present invention is as follows:

[0007] A dual-purpose drive power supply for a UV lamp, which is used to drive a UV mercury lamp or a UV-LED lamp, includes a three-phase rectification module, a low-pass filter module, a two-phase interleaved parallel BUCK module, and a full-bridge inverter module. Among them,

[0008] The three-phase rectification module is used to connect to three-phase alternating current and rectify the three-phase alternating current;

[0009] The low-pass filter module is connected to the three-phase rectification module and is used to filter out the ripple in the rectified output voltage;

[0010] The two-phase interleaved parallel BUCK module is connected to the low-pass filter module and is used to output a DC voltage to obtain an output effect with a higher switching frequency at a lower switching frequency;

[0011] The full-bridge inverter module is connected to the two-phase interleaved parallel BUCK module and is used to output an AC square wave at a fixed frequency by means of a full-bridge inverter topology for the converted output DC voltage of the two-phase interleaved parallel BUCK module and provide an ultra-high voltage trigger for the UV mercury lamp.

[0012] Preferably, the two-phase interleaved parallel BUCK module adopts a two-phase BUCK interleaved parallel circuit topology of BUCK1 and BUCK2. This BUCK module is composed of a BUCK1 formed by IGBT1 and IGBT1K in parallel and a BUCK2 formed by IGBT2 and IGBT2K in parallel.

[0013] Preferably, the gate of IGBT1 is connected to the parallel resistors R10 and diode D15, the gate of IGBT1K is connected to the parallel resistors R10K and diode D15K, the gate of IGBT2 is connected to the parallel resistors R15 and diode D20, the gate of IGBT2K is connected to the parallel resistors R15K and diode D20K. The collectors of IGBT1, IGBT1K, IGBT2 and IGBT2K are connected. After diode D1A and diode D1 are connected in parallel, the negative extreme is connected to the emitters of IGBT1 and IGBT1K. After diode D2A and diode D2 are connected in parallel, the negative extreme is connected to the emitters of IGBT2 and IGBT2K. The positive extremes of diode D1A, diode D1, diode D2A and diode D2 are connected to pins 1, 3, 5, 7 of chip P1. The emitters of IGBT1 and IGBT1K are also connected to pin 4 of chip TA1. The emitters of IGBT2 and IGBT2K are also connected to pin 1 of chip TA1. Pin 5 of chip TA1 is connected to pins 1, 3, 5 of chip P2. Pin 6 of chip TA1 is connected to pins 2, 4, 6 of chip P2.

[0014] Preferably, the full-bridge inverter module is further connected to a constant-current voltage transformation module, which is connected to the UV-LED lamp to provide high-voltage alternating current to drive the UV-LED lamp.

[0015] Preferably, the constant-current voltage transformation module includes a plurality of constant-current transformers. The primaries of the plurality of constant-current transformers are connected in series with each other. The secondaries of the plurality of constant-current transformers are independent of each other, and a rectifier bridge is connected to the secondary of each constant-current transformer. The output end of the rectifier bridge is connected to a plurality of the UV-LED lamps.

[0016] Preferably, it further includes a control single-chip microcomputer for controlling the power supply to the UV mercury lamp or the UV-LED lamp.

[0017] The dual-purpose driving power supply for a UV lamp provided by the present invention has the beneficial effects that: in the UV-LED lamp part, by adding an independent constant-current driving transformer and adopting a circuit structure with series-connected primaries and independent and current-equalizing power supply for secondaries, the UV-LED lamp can be seamlessly switched to access the alternating square-wave power supply provided by the driving power supply like a traditional UV mercury lamp, and the driving of multi-channel constant current of the LED is solved at a relatively low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic block diagram of the dual-purpose driving power supply for the UV lamp of the present invention;

[0019] Figure 2 is a schematic circuit diagram of the dual-phase interleaved parallel BUCK module;

[0020] Figure 3 is a schematic circuit diagram of the constant-current voltage transformation module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To further illustrate the embodiments, the present invention provides drawings. These drawings are a part of the disclosure of the present invention, mainly used to illustrate the embodiments, and can be combined with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0022] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0023] The dual-purpose driving power supply for the UV lamp provided in this embodiment, as Figure 1As shown, it is used to drive a UV mercury lamp or a UV-LED lamp, including a three-phase rectification module, a low-pass filtering module, a two-phase interleaved parallel BUCK module, and a full-bridge inversion module. Among them, the three-phase rectification module is used to connect to three-phase alternating current and rectify the three-phase alternating current; the low-pass filtering module is connected to the three-phase rectification module and is used to filter out the ripple in the rectified output voltage; the two-phase interleaved parallel BUCK module is connected to the low-pass filtering module and is used to output a DC voltage to obtain an output effect with a higher switching frequency at a lower switching frequency; the full-bridge inversion module is connected to the two-phase interleaved parallel BUCK module and is used to convert the output DC voltage after the two-phase interleaved parallel BUCK module through a full-bridge inversion topology structure to output an AC square wave at a fixed frequency and provide an ultra-high voltage trigger for the UV mercury lamp. This embodiment also adds a control single-chip microcomputer, which is used to control and select to supply power to the UV mercury lamp or the UV-LED lamp.

[0024] As Figure 2 shown, the two-phase interleaved parallel BUCK module of this embodiment adopts a BUCK interleaved parallel circuit topology of two phases, namely BUCK1 and BUCK2. This BUCK module is composed of a BUCK1 formed by IGBT1 and IGBT1K in parallel with a BUCK2 formed by IGBT2 and IGBT2K. Among them, the gate of IGBT1 is connected to the parallel resistors R10 and diode D15, the gate of IGBT1K is connected to the parallel resistors R10K and diode D15K, the gate of IGBT2 is connected to the parallel resistors R15 and diode D20, the gate of IGBT2K is connected to the parallel resistors R15K and diode D20K. The collectors of IGBT1, IGBT1K, IGBT2 and IGBT2K are connected. After diode D1A and diode D1 are connected in parallel, the negative extreme is connected to the emitters of IGBT1 and IGBT1K. After diode D2A and diode D2 are connected in parallel, the negative extreme is connected to the emitters of IGBT2 and IGBT2K. The positive extremes of diode D1A, diode D1, diode D2A and diode D2 are connected to pins 1, 3, 5, 7 of chip P1. The emitters of IGBT1 and IGBT1K are also connected to pin 4 of chip TA1. The emitters of IGBT2 and IGBT2K are also connected to pin 1 of chip TA1. Pin 5 of chip TA1 is connected to pins 1, 3, 5 of chip P2. Pin 6 of chip TA1 is connected to pins 2, 4, 6 of chip P2. For the specific circuit part of this embodiment, a topology structure of an interleaved two-phase parallel BUCK composed of a digital control method of a Renesas single-chip microcomputer combined with a digital-analog hybrid control of TI's analog integrated chip UC3856 to drive IGBTs is adopted, which can obtain an output effect with a higher switching frequency at a lower switching frequency (limited by the switching characteristics of IGBTs), thereby reducing the size of magnetic components.

[0025] In this embodiment, in order for the full-bridge inverter module to be compatible with the high-voltage square wave of UV-LED (ultra-high voltage without lighting trigger) at the same time, this high-voltage trigger circuit does not add any additional components, and purely relies on the precise control of the single-chip microcomputer to sweep the frequency to complete the lighting process. This is also a key link to achieve the compatibility of the two light source drives.

[0026] As Figure 3 shown, the full-bridge inverter module of this embodiment is also connected to a constant-current transformer module, and the constant-current transformer module is connected to the UV-LED lamp, and is used to provide high-voltage AC to drive the UV-LED lamp. The constant-current transformer module includes three constant-current transformers T1, T2, and T3. The primaries of the three constant-current transformers are connected in series with each other. The secondaries of the three constant-current transformers are independent of each other, and the output end of the rectifier bridge connected to the secondary of each constant-current transformer is connected to several UV-LED lamps. The volt-ampere characteristics of LEDs require the power supply to provide constant-current drive. It is a great challenge to provide equal-current constant-current drive for each LED lamp string. The circuit structure of this embodiment not only effectively solves the equal-current distribution of multiple LEDs (more than 20 paths), but also can be compatible with the power drive of AC square wave.

[0027] The preferred implementation specifically shows and introduces the present invention. However, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all are within the protection scope of the present invention.

Claims

1. A dual-purpose driving power supply for a UV lamp, characterized in that, For driving a UV mercury lamp or a UV-LED lamp, it includes a three-phase rectification module, a low-pass filtering module, a dual-phase interleaved parallel BUCK module, and a full-bridge inversion module. Among them, The three-phase rectification module is used to connect to three-phase alternating current and rectify the three-phase alternating current; The low-pass filtering module is connected to the three-phase rectification module and is used to filter out the ripple in the rectified output voltage; The dual-phase interleaved parallel BUCK module is connected to the low-pass filtering module and is used to output a DC voltage to obtain an output effect with a higher switching frequency at a lower switching frequency; the dual-phase interleaved parallel BUCK module adopts a BUCK interleaved parallel circuit topology of BUCK1 and BUCK2. This BUCK module is composed of a BUCK1 formed by IGBT1 and IGBT1K in parallel with a BUCK2 formed by IGBT2 and IGBT2K; the gate of IGBT1 is connected to the parallel resistors R10 and diode D15, the gate of IGBT1K is connected to the parallel resistors R10K and diode D15K, the gate of IGBT2 is connected to the parallel resistors R15 and diode D20, the gate of IGBT2K is connected to the parallel resistors R15K and diode D20K, the collectors of IGBT1, IGBT1K, IGBT2, and IGBT2K are connected. After diode D1A and diode D1 are connected in parallel, the negative extreme is connected to the emitters of IGBT1 and IGBT1K. After diode D2A and diode D2 are connected in parallel, the negative extreme is connected to the emitters of IGBT2 and IGBT2K. The positive extremes of diode D1A, diode D1, diode D2A, and diode D2 are connected to pins 1, 3, 5, and 7 of chip P1. The emitters of IGBT1 and IGBT1K are also connected to pin 4 of chip TA1. The emitters of IGBT2 and IGBT2K are also connected to pin 1 of chip TA1. Pin 5 of chip TA1 is connected to pins 1, 3, and 5 of chip P2. Pin 6 of chip TA1 is connected to pins 2, 4, and 6 of chip P2; The full-bridge inversion module is connected to the dual-phase interleaved parallel BUCK module and is used to output an AC square wave at a fixed frequency by converting the output DC voltage after conversion by the dual-phase interleaved parallel BUCK module through a full-bridge inversion topology structure and provide an ultra-high voltage trigger for the UV mercury lamp; The full-bridge inversion module is also connected to a constant current transformation module. The constant current transformation module is connected to the UV-LED lamp and is used to provide a high-voltage AC to drive the UV-LED lamp.

2. The dual-purpose driving power supply of a UV lamp according to claim 1, characterized in that, The constant current transformation module includes a plurality of constant current transformers. The primaries of the plurality of constant current transformers are connected in series with each other. The secondaries of the plurality of constant current transformers are independent of each other. And a rectifier bridge is connected to the secondary of each constant current transformer. The output end of the rectifier bridge is connected to a plurality of the UV-LED lamps.

3. The dual-purpose drive power supply for a UV lamp according to claim 1 or 2, characterized in that, It also includes a control single-chip microcomputer, which is used to control and select to supply power to the UV mercury lamp or the UV-LED lamp.

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