Circuit of LED digital addressable lighting interface power supply based on LLC topology

Abstract

The utility model discloses a circuit of an LED digital addressable lighting interface power supply based on LLC topology, which relates to the technical field of LLC topology circuits and comprises a single chip microcomputer control circuit module electrically connected with a dummy load control circuit module. The dummy load control circuit module is electrically connected with the 50mA dummy load connection module and the 50mA dummy load disconnection module; when the signal sent by the dimmer to the single chip microcomputer is' ON ', the single chip microcomputer gives out a control signal, the output end of the corresponding circuit to the driving power supply is connected with a 50mA dummy load, and the dummy load can ensure that the IC does not enter a hiccup mode to work when the dimming is 1%, so that stroboflash is avoided; when the signal from the dimmer to the single-chip microcomputer is' OFF ', the single-chip microcomputer gives a control signal to disconnect the dummy load, thereby ensuring that the standby power consumption of the whole power supply can meet the requirement that European Union standard ERP2.0 is less than 0.5 W.

Description

Technical Field

[0001] This utility model specifically relates to the field of LLC topology circuit technology, and more specifically to a circuit for an LED digitally addressable lighting interface power supply based on LLC topology. Background Technology

[0002] The power supply currently being developed uses an LLC topology and Infineon's ICL5102 as the main IC. When dimmed to 1%, the IC enters an intermittent hiccup mode. Under extremely light load hiccups, the ICL5102 exhibits low-frequency ripple in its output voltage. Since the load is an LED strip, flickering is visible to the human eye when the dimming is at its lowest setting.

[0003] We provide a control signal that, when the dimmer sends an "ON" signal to the microcontroller, the microcontroller outputs a 50mA dummy load to the output of the drive power supply. This dummy load ensures that the IC will not enter hiccup mode when dimming to 1%. Utility Model Content

[0004] The purpose of this invention is to provide a circuit for an LED digital addressable lighting interface power supply based on LLC topology. When the dimmer sends an "OFF" signal to the microcontroller, the microcontroller provides a control signal to disconnect the dummy load, ensuring that the standby power consumption of the entire power supply meets the EU standard ERP2.0 < 0.5W requirement, thereby solving the technical problems mentioned in the background.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A circuit for an LED digitally addressable lighting interface power supply based on LLC topology includes a microcontroller control circuit module electrically connected to a dummy load control circuit module; the dummy load control circuit module is electrically connected to a 50mA dummy load on module and a 50mA dummy load off module.

[0007] As a further technical solution of this utility model, the microcontroller control circuit module includes a microcontroller and a dimmer; the dimmer is electrically connected to the microcontroller.

[0008] As a further technical solution of this utility model, the 18-pin connection of the microcontroller to the 50mA dummy load connection module is described.

[0009] As a further technical solution of this utility model, the 19-pin of the microcontroller is connected to the dimmer, and the 22-24-pin of the microcontroller are connected to the various ports of the dimmer.

[0010] As a further technical solution of this utility model, the 50mA dummy load switching module includes a PNP transistor Q504, with a diode connected between the collector and emitter of the PNP transistor Q504; a resistor R515 is connected to the base of the PNP transistor Q504; and a resistor R517 is connected between the base and emitter of the PNP transistor Q504.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. In this utility model, when the signal from the dimmer to the microcontroller is "ON", the microcontroller gives a control signal to connect a 50mA dummy load to the output terminal of the drive power supply. This dummy load can ensure that the IC will not enter the hiccup mode when dimming to 1%, so there will be no flicker.

[0013] 2. In this utility model, when the signal from the dimmer to the microcontroller is "OFF", the microcontroller gives a control signal to disconnect the dummy load, ensuring that the standby power consumption of the entire power supply can meet the EU standard ERP2.0 < 0.5W requirement;

[0014] 3. This utility model provides control signals through a single-chip microcontroller. When the dimmer sends an "ON" signal, the power supply carries a 50mA dummy load, preventing the IC from entering hiccup mode and solving the flicker problem during 1% dimming. When the dimmer sends an "OFF" signal, the microcontroller controls the disconnection of the dummy load, ensuring compliance with EU ERP2.0 requirements regarding standby power consumption. Attached Figure Description

[0015] Figure 1 This is the circuit block diagram of this utility model.

[0016] Figure 2 This is the circuit diagram of the microcontroller control circuit module of this utility model.

[0017] Figure 3 This is the circuit diagram of the dummy load control circuit module of this utility model.

[0018] In the diagram: 1. Microcontroller control circuit module; 2. 50mA dummy load connection module; 3. Dummy load control circuit module; 4. 50mA dummy load disconnection module. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-3 In this embodiment of the present invention, a circuit for an LED digitally addressable lighting interface power supply based on LLC topology includes a microcontroller control circuit module 1, which is electrically connected to a dummy load control circuit module 3; the dummy load control circuit module 3 is electrically connected to a 50mA dummy load connection module 2 and a 50mA dummy load disconnection module 4.

[0021] More specifically, the microcontroller control circuit module 1 includes a microcontroller and a dimmer; the dimmer is electrically connected to the microcontroller; the 18-pin connector of the microcontroller is connected to a 50mA dummy load to connect module 2; the 19-pin connector of the microcontroller is connected to the dimmer, and the 22-24-pin connectors of the microcontroller are connected to the respective ports of the dimmer.

[0022] By adopting the above technical solution, a control signal is provided by a single microcontroller. When the dimmer sends an "ON" signal, the power supply carries a 50mA dummy load, preventing the IC from entering hiccup mode and solving the flicker problem at 1% dimming. When the dimmer sends an "OFF" signal, the microcontroller disconnects the dummy load, ensuring compliance with EU ERP2.0 requirements regarding standby power consumption.

[0023] As attached Figure 2 As shown, in this embodiment, the 50mA dummy load switching module 2 includes a PNP transistor Q504, with a diode connected between the collector and emitter of the PNP transistor Q504; a resistor R515 is connected to the base of the PNP transistor Q504; and a resistor R517 is connected between the base and emitter of the PNP transistor Q504.

[0024] By adopting the above technical solution, the dimmer connected to the microcontroller via pins 22, 23, and 24 sends signals to the microcontroller, which are responsible for telling the microcontroller to execute "ON" / "OFF" or to adjust the dimming brightness.

[0025] The specific status is as follows:

[0026] State 1: When the microcontroller receives the "ON" signal, the 18-pin connector outputs a high-level 3.3V signal "Dummy_Load", such as " Figure 2When the gate of Q504 is high, Q504 is saturated and conducting. At this time, a 470Ω dummy load (24V÷470Ω≈50mA) is connected to the LED driver output voltage V+. When the power supply has a 50mA dummy load, the IC will not operate in hiccup mode, and the output voltage ripple will not have a low-frequency component, so there is no flicker.

[0027] State 2: When the microcontroller receives the "OFF" signal, pin 18 outputs a low-level 0V signal "Dummy_Load"; such as " Figure 2 When the gate of Q504 is low, Q504 is cut off, and the 470Ω dummy load connected to the LED driver output voltage V+ is disconnected. At this time, the IC will enter hiccup mode to ensure that the standby power consumption is <0.5W.

[0028] The working principle of this invention is as follows: A control signal is provided by a single-chip microcontroller. When the dimmer sends an "ON" signal, the power supply carries a 50mA dummy load, preventing the IC from entering hiccup mode and solving the flicker problem during 1% dimming. When the dimmer sends an "OFF" signal, the microcontroller disconnects the dummy load, ensuring compliance with EU ERP2.0 requirements regarding standby power consumption.

[0029] It can simultaneously solve the problem of 1% flicker in the dimmest dimming mode and the problem of standby power consumption requirement of <0.5W without using a high-end main control IC.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A circuit for an LED digitally addressable lighting interface power supply based on an LLC topology, characterized by: The single-chip microcomputer control circuit module (1) is electrically connected with the dummy load control circuit module (3); the dummy load control circuit module (3) is electrically connected with the 50mA dummy load on module (2) and the 50mA dummy load off module (4) respectively.

2. The LLC topology based LED digitally addressable lighting interface power supply circuit according to claim 1, wherein: The single-chip microcomputer control circuit module (1) comprises a single-chip microcomputer and a dimmer; the dimmer is electrically connected with the single-chip microcomputer.

3. The LLC topology based LED digitally addressable lighting interface power supply circuit according to claim 2, wherein: The 18PIN of the single-chip microcomputer is connected with the 50mA dummy load on module (2).

4. The LLC topology based LED digitally addressable lighting interface power supply circuit of claim 1, wherein: The 19PIN of the single-chip microcomputer is connected with the dimmer, and the 22-24PIN of the single-chip microcomputer is connected with each port of the dimmer.

5. The LLC topology based LED digitally addressable lighting interface power supply circuit of claim 1, wherein: The 50mA dummy load on module (2) comprises a PNP type triode Q504, and a diode is connected between the collector and the emitter of the PNP type triode Q504; the base of the PNP type triode Q504 is connected with a resistor R515; and a resistor R517 is connected between the base and the emitter of the PNP type triode Q504.

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