Two-wire LLC driving power supply for a lamp

Abstract

The utility model discloses a two line LLC drive power supply for lamps and lanterns, including three line input terminal, two line output terminal, three line input terminal is connected with constant voltage power supply circuit, and the constant current power supply circuit is connected with constant voltage power supply circuit, and the linear voltage stabilizing power supply circuit is connected with constant voltage power supply circuit, two line output terminal is connected with two line H bridge drive circuit, and the overvoltage protection circuit is connected with two line H bridge drive circuit, and the PWM control circuit is connected with two line H bridge drive circuit and the intelligent regulation circuit is connected with PWM control circuit, and the PWM control circuit is connected with constant voltage power supply circuit through photoelectric coupling control circuit, and the signal end of PWM control circuit is connected with overvoltage protection circuit, the utility model discloses the structure is reasonably arranged, has overvoltage protection circuit cooperation intelligent regulation circuit, still is provided with two line H bridge drive circuit and PWM control circuit, can guarantee the use stability and reliability of overall circuit, has increased the drive ability of LLC.

Description

Technical Field

[0001] This utility model belongs to the field of lighting driver power supply technology, specifically relating to a two-wire LLC driver power supply for lighting fixtures. Background Technology

[0002] LLC driver circuits for lighting fixtures are resonant circuits that achieve constant voltage by controlling the switching frequency. They have the advantages of low switching loss and high power conversion efficiency. Conventional LLC driver circuits for lighting fixtures have limited functionality and lack corresponding protection and control circuits, which limits their stability and makes it difficult to meet market demands. Utility Model Content

[0003] The purpose of this invention is to provide a two-wire LLC driver power supply for lighting fixtures with a reasonable structural design that improves operational stability.

[0004] The technical solution to achieve the purpose of this utility model is a two-wire LLC driver power supply for lamps, including a three-wire input terminal and a two-wire output terminal. The three-wire input terminal is connected to a constant voltage power supply circuit, a constant current power supply circuit connected to the constant voltage power supply circuit, and a linear voltage regulator power supply circuit connected to the constant voltage power supply circuit.

[0005] The two-wire output terminals are connected to a two-wire H-bridge drive circuit, an overvoltage protection circuit connected to the two-wire H-bridge drive circuit, a PWM control circuit connected to the two-wire H-bridge drive circuit, and an intelligent adjustment circuit connected to the PWM control circuit.

[0006] The PWM terminal of the PWM control circuit is connected to the PWM terminal of the constant current power supply circuit, and the PWM control circuit is connected to the constant voltage power supply circuit through an optocoupler control circuit.

[0007] The signal terminal of the PWM control circuit is connected to the overvoltage protection circuit;

[0008] The linear voltage regulator circuit is connected to the power supply terminal of the two-wire H-bridge drive circuit and the power supply terminal of the overvoltage protection circuit.

[0009] A further preferred embodiment is that the two-wire H-bridge drive circuit includes a first drive circuit and a second drive circuit connected in parallel to the two-wire output terminals;

[0010] The output terminals of the first drive circuit and the second drive circuit are connected to the overvoltage protection circuit.

[0011] The first drive circuit is connected to the PWM control circuit.

[0012] More preferably, the first driving circuit includes a driving chip, a first MOS transistor control circuit connected to the HO pin of the driving chip, and a second MOS transistor control circuit connected to the LO pin of the driving chip.

[0013] The drain of the first MOSFET control circuit is connected to a 36V power supply, and the source of the first MOSFET control circuit and the drain of the second MOSFET control circuit are both connected to the transformer output terminal of the two-line output terminal.

[0014] A further preferred embodiment is that the first drive circuit and the second drive circuit have the same circuitry.

[0015] This utility model has positive effects: its structure is reasonably designed, and it not only has an overvoltage protection circuit combined with an intelligent adjustment circuit, but also a two-wire H-bridge drive circuit and a PWM control circuit, which can ensure the stability and reliability of the overall circuit, increase the driving capability of LLC, and has strong applicability. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0017] Figure 1 This is a circuit block diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the specific circuit of this utility model;

[0019] Figure 3 This is a schematic diagram of the three-wire input terminal and constant voltage power supply circuit in this utility model.

[0020] Figure 4 This is a detailed circuit diagram of the two-wire H-bridge drive circuit and overvoltage protection circuit in this utility model.

[0021] Figure 5 This is a schematic diagram of the PWM control circuit and the intelligent adjustment circuit in this utility model.

[0022] Figure 6 This is a schematic diagram of the constant current power supply circuit and the linear voltage regulator circuit in this utility model.

[0023] Reference numerals: 1. Three-wire input terminal; 2. Two-wire output terminal; 3. Constant voltage power supply circuit; 4. Constant current power supply circuit; 5. Linear voltage regulator power supply circuit; 6. Two-wire H-bridge drive circuit; 61. First drive circuit; 611. Drive chip; 612. First MOSFET control circuit; 613. Second MOSFET control circuit; 62. Second drive circuit; 7. Overvoltage protection circuit; 8. PWM control circuit; 9. Intelligent adjustment circuit; 10. Optocoupler control circuit. Detailed Implementation

[0024] 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 protection scope of the present utility model.

[0025] Example

[0026] See Figures 1 to 6 As shown, a two-wire LLC driver power supply for lighting fixtures includes a three-wire input terminal 1 and a two-wire output terminal 2. The three-wire input terminal is connected to a constant voltage power supply circuit 3, a constant current power supply circuit 4 connected to the constant voltage power supply circuit, and a linear voltage regulator power supply circuit 5 connected to the constant voltage power supply circuit. In this embodiment, the constant voltage power supply circuit includes a rectifier filter circuit, a transformer circuit, a constant voltage chip circuit, and a voltage regulator circuit, while the constant current power supply circuit includes a constant current chip and a filter circuit. The linear voltage regulator power supply circuit ensures the effectiveness and stability of the linear voltage.

[0027] In this embodiment, the two-wire output terminals are connected to a two-wire H-bridge drive circuit 6, an overvoltage protection circuit 7 connected to the two-wire H-bridge drive circuit, a PWM control circuit 8 connected to the two-wire H-bridge drive circuit, and an intelligent adjustment circuit 9 connected to the PWM control circuit. The intelligent adjustment circuit can reduce the 400V voltage to a corresponding voltage for use, and it is connected to the PWM control circuit to achieve control and adjustment to meet the needs of different situations. When connected, the PWM terminal of the PWM control circuit is connected to the PWM terminal of the constant current power supply circuit, and the PWM control circuit is connected to the constant voltage power supply circuit through an optocoupler control circuit 10. The signal terminal of the PWM control circuit is connected to the overvoltage protection circuit. The linear voltage regulator power supply circuit is connected to the power supply terminal of the two-wire H-bridge drive circuit and the power supply terminal of the overvoltage protection circuit.

[0028] In this embodiment, the two-wire H-bridge drive circuit includes a first drive circuit 61 and a second drive circuit 62 connected in parallel to the two-wire output terminals. The output terminals of the first and second drive circuits are connected to the overvoltage protection circuit. The first drive circuit is connected to the PWM control circuit. The first drive circuit includes a drive chip 611, a first MOS transistor control circuit 612 connected to the HO pin of the drive chip, and a second MOS transistor control circuit 613 connected to the LO pin of the drive chip. The drive chip is a conventional drive chip of the prior art, and its model can be selected as needed, so it is not described in detail. Furthermore, the drain of the first MOS transistor control circuit is connected to a 36V power supply, and the source and drain of both the first and second MOS transistor control circuits are connected to the transformer output terminals of the two-wire output terminals. The circuits of the first and second drive circuits are identical.

[0029] This utility model has positive effects: its structure is reasonably designed, and it not only has an overvoltage protection circuit combined with an intelligent adjustment circuit, but also a two-wire H-bridge drive circuit and a PWM control circuit, which can ensure the stability and reliability of the overall circuit, increase the driving capability of LLC, and has strong applicability.

[0030] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural parts described in the instruction manual can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so they will not be described in detail here.

[0031] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, these obvious variations or modifications derived from the essential spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A two-wire LLC driver power supply for lighting fixtures, comprising a three-wire input terminal and a two-wire output terminal, characterized in that: The three-wire input terminal is connected to a constant voltage power supply circuit, a constant current power supply circuit connected to the constant voltage power supply circuit, and a linear voltage regulator power supply circuit connected to the constant voltage power supply circuit. The two-wire output terminals are connected to a two-wire H-bridge drive circuit, an overvoltage protection circuit connected to the two-wire H-bridge drive circuit, a PWM control circuit connected to the two-wire H-bridge drive circuit, and an intelligent adjustment circuit connected to the PWM control circuit. The PWM terminal of the PWM control circuit is connected to the PWM terminal of the constant current power supply circuit, and the PWM control circuit is connected to the constant voltage power supply circuit through an optocoupler control circuit. The signal terminal of the PWM control circuit is connected to the overvoltage protection circuit; The linear voltage regulator circuit is connected to the power supply terminal of the two-wire H-bridge drive circuit and the power supply terminal of the overvoltage protection circuit.

2. The two-wire LLC driver power supply for lighting fixtures according to claim 1, characterized in that: The two-wire H-bridge drive circuit includes a first drive circuit and a second drive circuit connected in parallel to the two-wire output terminals. The output terminals of the first drive circuit and the second drive circuit are connected to the overvoltage protection circuit. The first drive circuit is connected to the PWM control circuit.

3. A two-wire LLC driver power supply for lighting fixtures according to claim 2, characterized in that: The first driving circuit includes a driving chip, a first MOS transistor control circuit connected to the HO pin of the driving chip, and a second MOS transistor control circuit connected to the LO pin of the driving chip. The drain of the first MOSFET control circuit is connected to a 36V power supply, and the source of the first MOSFET control circuit and the drain of the second MOSFET control circuit are both connected to the transformer output terminal of the two-line output terminal.

4. A two-wire LLC driver power supply for lighting fixtures according to claim 3, characterized in that: The first drive circuit and the second drive circuit have the same circuit.

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