LED dimming power supply with low standby power consumption and short circuit power consumption

Abstract

The utility model discloses an LED dimming power supply with low standby power consumption and short circuit power consumption. The LED dimming power supply comprises a PFC module, a DC-DC module, a short circuit detection module, a power supply module, a control module and a dimming module. The control module can open a power supply path between the power supply module and the PFC module and between the power supply module and the DC-DC module when receiving a dimming signal sent by the dimming module. Or the control module can close the power supply paths between the power supply module and the PFC module and between the power supply module and the DC-DC module when receiving the standby signal sent by the dimming module and / or the short circuit signal sent by the short circuit detection module; according to the circuit, only the dimming module needs power supply maintenance during standby, the standby power consumption of the whole machine is greatly reduced, meanwhile, damage to an LED caused by abnormal short circuit of output is avoided, and a layer of protection is added for use of a user.

Description

Technical Field

[0001] The utility model relates to the field of intelligent LED dimming power supply, in particular to an LED dimming power supply with low standby power consumption and short-circuit power consumption. Background Art

[0002] With the mature development of the LED industry, LED products have entered thousands of households. Some national regulations and user needs have increasingly higher requirements for energy conservation. Some regulations explicitly require that the standby power consumption be ≤0.5W. At present, the standby power consumption of most LED dimming power supplies on the market can only barely meet the standards. At the same time, although the LED dimming power supply has its own short-circuit protection function, the short-circuit power consumption is large and the power consumption generated by the short-circuit is basically on the switch tube. A long-term short circuit may cause significant damage to some components of the power supply, and then cause some dangerous situations such as fire and smoke in the LED power supply. Therefore, there is an urgent need for an LED dimming power supply with low standby power consumption and short-circuit power consumption to meet the needs of national regulations and the market, thereby reducing the hazards caused under abnormal conditions. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an LED dimming power supply with low standby power consumption and short-circuit power consumption.

[0004] An embodiment of the utility model solves the technical problem by adopting a technical solution: an LED dimming power supply with low standby power consumption and short-circuit power consumption, comprising a PFC module, a DC-DC module, a short-circuit detection module, a power supply module, a control module and a dimming module;

[0005] The PFC module, the DC-DC module, and the short-circuit detection module are sequentially connected between the AC power supply and the load, and the short-circuit detection module is used to generate a short-circuit signal when an output short circuit is detected;

[0006] The input end of the power supply module is connected to the output end of the PFC module, and the output end of the power supply module is connected to the short-circuit detection module, the control module and the dimming module;

[0007] The control module is connected with the PFC module, the DC-DC module, the short circuit detection module and the dimming module;

[0008] The dimming module receives a dimming signal or a standby signal;

[0009] The control module can open the power supply path between the power supply module and the PFC module, DC-DC module when receiving a dimming signal sent by the dimming module, or the control module can close the power supply path between the power supply module and the PFC module, DC-DC module when receiving a standby signal sent by the dimming module and / or a short circuit signal sent by the short circuit detection module.

[0010] As one of the preferred embodiments of the utility model, the short circuit detection module includes a resistor R5, a light emitter U1B of an optocoupler U1 and diodes D2-D3, one end of the resistor R5 is connected to the S-VCC end of the power supply module, the other end of the resistor R5 is connected to one end of the light emitter U1B of the optocoupler U1, the other end of the light emitter U1B of the optocoupler U1 is respectively connected to the cathode of the diode D3 and the LED+ end of the LED power supply via the diode D2, and the anode of the diode D3 is connected to the LED- end of the LED power supply.

[0011] As one of the preferred embodiments of the utility model, the control module includes resistors R1-R4, a PMOS tube Q1, an NMOS tube Q2, a capacitor C1, a diode D1 and a light receiver U1A of an optocoupler U1. One end of the resistor R1 and the source of the PMOS tube Q1 are connected to the VCC end of the power supply module, the other end of the resistor R1 is respectively connected to the gate of the PMOS tube Q1 and one end of the resistor R2, the drain of the PMOS tube is connected to the VCC-1 end of the PFC module and the DC-DC module, the other end of the resistor R2 is connected to the drain of the NMOS tube Q2, the gate of the NMOS tube Q2 is respectively connected to one end of the resistor R3, one end of the capacitor C1, one end of the resistor R4 and one end of the light receiver U1A of the optocoupler U1, the source of the NMOS tube Q2, the other end of the resistor R3, the other end of the capacitor C1 and the other end of the light receiver U1A of the optocoupler U1 are connected to the GND end, and the other end of the resistor R4 is connected to the PWM end of the dimming module via the diode D1.

[0012] The beneficial effects of the utility model include: an LED dimming power supply with low standby power consumption and short-circuit power consumption, comprising a PFC module, a DC-DC module, a short-circuit detection module, a power supply module, a control module and a dimming module; the short-circuit detection module is used to generate a short-circuit signal when an output short circuit is detected; the dimming module is connected to the dimming signal or the standby signal; the control module can open the power supply path between the power supply module and the PFC module and the DC-DC module when receiving the dimming signal sent by the dimming module, or the control module can close the power supply path between the power supply module and the PFC module and the DC-DC module when receiving the standby signal sent by the dimming module and / or the short-circuit signal sent by the short-circuit detection module; through the above circuit, only the dimming module needs to be powered on in standby mode, which greatly reduces the standby power consumption of the whole machine, and also avoids the harm to the LED when an abnormal short circuit occurs in the output, thereby adding a layer of protection for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 The schematic diagram of a LED dimming power supply with low standby power consumption and short-circuit power consumption is shown in FIG.

[0015] Figure 2 A circuit schematic diagram of an LED dimming power supply with low standby power consumption and short-circuit power consumption;

[0016] Figure 3 This is the circuit schematic diagram of the short circuit detection module;

[0017] Figure 4 This is the circuit schematic diagram of the control module. DETAILED DESCRIPTION

[0018] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0019] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0020] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0022] Reference Figures 1 to 4, an LED dimming power supply with low standby power consumption and short-circuit power consumption, comprising an EMC rectifier filter module 10, a PFC module 20, a DC-DC module 30, a short-circuit detection module 40, a power supply module 50, a control module 60 and a dimming module 70;

[0023] The EMC rectifier filter module 10, the PFC module 20, the DC-DC module 30, and the short-circuit detection module 40 are sequentially connected between the AC power supply and the load, and the short-circuit detection module 40 is used to generate a short-circuit signal when an output short circuit is detected;

[0024] The input end of the power supply module 50 is connected to the output end of the PFC module 20, and the output end of the power supply module 50 is connected to the short circuit detection module 40, the control module 60 and the dimming module 70;

[0025] The control module 60 is connected to the PFC module 20, the DC-DC module 30, the short circuit detection module 40 and the dimming module 70;

[0026] The dimming module 70 receives a dimming signal or a standby signal;

[0027] The control module 60 may open the power supply path between the power supply module 50 and the PFC module 20, as well as the DC-DC module 30 upon receiving a dimming signal sent by the dimming module 70, or the control module 60 may close the power supply path between the power supply module 50 and the PFC module 20, as well as the DC-DC module 30 upon receiving a standby signal sent by the dimming module 70 and / or a short circuit signal sent by the short circuit detection module 40.

[0028] 1) Reference Figure 1 The utility model provides an LED dimming power supply with low standby power consumption and short-circuit power consumption, including an EMC rectifier filter module 10, a PFC module 20, a DC-DC module 30, a short-circuit detection module 40, a power supply module 50, a control module 60 and a dimming module 70;

[0029] Among them, the input end of the EMC rectifier and filter module 10 is connected to the external AC power supply AC, and the output end of the EMC rectifier and filter module 10 is connected to the input end of the PFC module 20 to improve the power factor and reduce harmonics and interference to the power supply equipment; the input end of the DC-DC module 30 is connected to the output end of the PFC module 20; the output end of the DC-DC module 30 provides energy to the output ends LED+ and LED- through the short-circuit detection module 40, and the amount of energy provided by the output ends LED+ and LED- is controlled by the PWM port of the dimming module 70, the input end of the power supply module 50 is connected to the VBUS and GND ports, the output VCC end is connected to the control module 60 to supply power to the VCC-1 of the PFC module 20 and the DC-DC module 30, the output S-VCC end and the SGND end are supplied to the short-circuit detection module 40, and the output F-VCC end and the FGND end are supplied to the dimming module 70;

[0030] The control module 60 receives signal control from the dimming module 70 and the short-circuit detection module 40. When the dimming module 70 receives a standby signal or an output short-circuit signal from the short-circuit detection module 40, the control module 60 disconnects the power supply to the PFC module 20 and the DC-DC module 30, and the power supply enters a low power consumption mode. The short-circuit detection module 40 is triggered to work only when the output terminals LED+ and LED- are short-circuited, and it automatically resumes normal operation after the short-circuit anomaly is resolved. The dimming module 70 works in the corresponding mode according to the input command.

[0031] 2) Reference Figure 2-Figure 4 , the principle of reducing standby power consumption is as follows:

[0032] In some embodiments, the control module 60 includes resistors R1-R4, a PMOS tube Q1, an NMOS tube Q2, a capacitor C1, a diode D1, and a light receiver U1A of an optocoupler U1, wherein the optocoupler U1 includes a light receiver U1A and a light emitter U1B, one end of the resistor R1 and the source of the PMOS tube Q1 are connected to the VCC end of the power supply module 50, the other end of the resistor R1 is respectively connected to the gate of the PMOS tube Q1 and one end of the resistor R2, and the drain of the PMOS tube is connected to the PFC module 20 and the DC-D The VCC-1 end of the C module 30 is connected, the other end of the resistor R2 is connected to the drain of the NMOS tube Q2, the gate of the NMOS tube Q2 is respectively connected to one end of the resistor R3, one end of the capacitor C1, one end of the resistor R4 and one end of the light receiver U1A of the optocoupler U1, the source of the NMOS tube Q2, the other end of the resistor R3, the other end of the capacitor C1 and the other end of the light receiver U1A of the optocoupler U1 are connected to the GND end, and the other end of the resistor R4 is connected to the PWM end of the dimming module 70 via the diode D1.

[0033] Specifically, when the power supply is working, the dimming module 70 outputs a PWM signal to the DC-DC module 30 for decoding and calculating and outputting a corresponding current. At the same time, a driving voltage is provided to the NMOS tube Q2 through the diode D1 and the resistor R4. The diode D1 is preferably a signal switch diode to prevent the gate signal of the NMOS tube Q2 from being pulled down when the PWM signal is a rectangular wave. The resistor R4 is a resistor with a small resistance value, which is used to limit the driving current. The capacity of the capacitor C1 can be appropriately larger, and the resistance value of the resistor R3 can be appropriately larger. This is because the NMOS tube is a voltage-controlled element, so the capacitor C1 can also maintain the conduction of the NMOS tube Q2 when the duty cycle of the rectangular wave is very small. After the NMOS tube Q2 is turned on, the gate control voltage of the PMOS tube Q1 is divided by the resistors R1 and R2, so that the VG of the PMOS tube Q1 is less than VS. The PMOS tube Q1 is turned on, and the power supply module 50 supplies power to the PFC module 20 and the DC-DC module 30 through the PMOS tube Q1, and the power supply maintains normal operation; when the dimming module 70 receives the standby command, the PWM dimming signal is turned off, and the DC-DC module 30 stops outputting energy. At the same time, the resistor R3 of the control module 60 consumes the energy on the capacitor C1 after a short period of time, so that the NMOS tube Q2 is turned off, so that the VG of the PMOS tube Q1 is equal to VS, the PMOS tube Q1 is turned off, and the control module 60 shuts off the power supply path from the VCC end of the power supply module 50 to the PFC module 20 and the DC-DC module 30; at this time, only the dimming module 70 needs the power supply module 50 to provide energy for maintenance, which greatly reduces the energy loss of the LED power supply in the standby state, and can easily achieve the requirement of far less than the regulatory requirement of ≤0.5W standby power consumption.

[0034] 3) Reference Figure 2-Figure 4 , the principle of reducing short-circuit power consumption is as follows:

[0035] In some embodiments, the short circuit detection module 40 includes a resistor R5, a light emitter U1B of an optocoupler U1, and diodes D2-D3, one end of the resistor R5 is connected to the S-VCC terminal of the power supply module 50, the other end of the resistor R5 is connected to one end of the light emitter U1B of the optocoupler U1, the other end of the light emitter U1B of the optocoupler U1 is connected to the cathode of the diode D3 and the LED+ terminal of the LED power supply via the diode D2, and the anode of the diode D3 is connected to the LED- terminal of the LED power supply.

[0036] Specifically, when the power supply is working normally, the output voltage is much higher than the voltage at the S-VCC terminal. At this time, the light emitter U1B (Pin1-2) and the diode D2 of the optocoupler U1 are not conducting, and the diode D3 is reversely connected in parallel to the output LED+ and LED-, so it is not conducting. The light receiver U1A (Pin3-4) of the optocoupler U1 is also not conducting. The control module 60 turns on the VCC power supply path of the PFC module 20 and the DC-DC module 30, and the power supply works normally.

[0037] When the output terminals LED+ and LED- of the LED power supply are abnormally short-circuited, the working circuit of the short-circuit detection module 40 is: the S-VCC terminal of the power supply module 50 → resistor R5 → Pin1 of the light emitter U1B of the optocoupler U1 → Pin2 of the light emitter U1B of the optocoupler U1 → diode D2 → short circuit of LED+ and LED- → SGND terminal, the potentials of LED+, LED- and SGND terminals are the same, the S-VCC terminal turns on the light emitter U1B (Pin1-2) of the optocoupler U1 and the diode D2 through the resistor R5, so that the light receiver U1A (Pin3-4) of the optocoupler U1 is also turned on, the gate potential of the NMOS tube Q2 is pulled down, and the NMOS tube Q2 changes from the on state to the off state. When the NMOS tube Q2 is turned on, the NMOS tube Q2 is turned off. The S tube Q2 is cut off, the gate voltage and the source voltage of the PMOS tube Q1 are equal, and the PMOS tube Q1 also changes from the on state to the off state, so that the control module 60 cuts off the power supply path from the VCC end of the power supply module 50 to the PFC module 20 and the DC-DC module 30, and the PFC module 20 and the DC-DC module 30 do not work. Only the dimming module 70 needs the power supply module 50 to provide energy for maintenance, which greatly reduces the energy loss of the LED power supply in the short-circuit state; the role of the diode D3 is to prevent the parasitic parameters of the line from oscillating and damaging the components when the output terminals LED+ and LED- are abnormally short-circuited, which can avoid some dangerous situations caused by secondary damage to the components caused by the output short-circuit, thereby increasing the safety of users' daily use.

[0038] 4) When the short-circuit state is released at the output end of the LED power supply, the "LED+ and LED- short circuit" in the working circuit of the short-circuit detection module 40 becomes "LED+ and LED- open circuit", and the working circuit of the short-circuit detection module 40 is blocked, causing the optocoupler U1 to not work. The PWM signal output by the dimming module 70 drives the NMOS tube Q2 to turn on again, which also turns on the PMOS tube Q1. The control module 60 turns on the VCC end of the power supply module 50 to the power supply path of the PFC module 20 and the DC-DC module 30, and the power supply resumes normal operation.

[0039] 5) The advantage of the utility model is that: through the above circuit, only the dimming module needs to be powered when in standby mode, which greatly reduces the standby power consumption of the whole machine, and also avoids the damage to the LED when an abnormal short circuit occurs in the output, adding a layer of protection for users.

[0040] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. An LED dimming power supply with low standby power consumption and short-circuit power consumption, comprising a PFC module (20), a DC-DC module (30) and a dimming module (70), characterized in that: It also includes a short circuit detection module (40), a power supply module (50) and a control module (60); The PFC module (20), the DC-DC module (30), and the short-circuit detection module (40) are connected in sequence between the AC power source and the load, and the short-circuit detection module (40) is used to generate a short-circuit signal when an output short-circuit is detected; The input end of the power supply module (50) is connected to the output end of the PFC module (20), and the output end of the power supply module (50) is connected to the short-circuit detection module (40), the control module (60) and the dimming module (70); The short circuit detection module (40) comprises a resistor R5, a light emitter U1B of an optical coupler U1, and diodes D2-D3, one end of the resistor R5 is connected to the S-VCC end of the power supply module (50), the other end of the resistor R5 is connected to one end of the light emitter U1B of the optical coupler U1, the other end of the light emitter U1B of the optical coupler U1 is respectively connected to the cathode of the diode D3 and the LED+ end of the LED power supply via the diode D2, and the anode of the diode D3 is connected to the LED- end of the LED power supply; The control module (60) is connected to the PFC module (20), the DC-DC module (30), the short-circuit detection module (40) and the dimming module (70); The dimming module (70) receives a dimming signal or a standby signal; The control module (60) may open the power supply path between the power supply module (50) and the PFC module (20) and the DC-DC module (30) upon receiving a dimming signal sent by the dimming module (70), or the control module (60) may close the power supply path between the power supply module (50) and the PFC module (20) and the DC-DC module (30) upon receiving a standby signal sent by the dimming module (70) and / or a short-circuit signal sent by the short-circuit detection module (40).

2. The LED dimming power supply with low standby power consumption and short-circuit power consumption according to claim 1, characterized in that: The control module (60) comprises resistors R1-R4, a PMOS tube Q1, an NMOS tube Q2, a capacitor C1, a diode D1 and a light receiver U1A of an optical coupler U1, one end of the resistor R1 and the source of the PMOS tube Q1 are connected to the VCC end of the power supply module (50), the other end of the resistor R1 is respectively connected to the gate of the PMOS tube Q1 and one end of the resistor R2, and the drain of the PMOS tube is connected to the VCC- 1, the other end of the resistor R2 is connected to the drain of the NMOS tube Q2, the gate of the NMOS tube Q2 is respectively connected to one end of the resistor R3, one end of the capacitor C1, one end of the resistor R4 and one end of the light receiver U1A of the optocoupler U1, the source of the NMOS tube Q2, the other end of the resistor R3, the other end of the capacitor C1 and the other end of the light receiver U1A of the optocoupler U1 are connected to the GND end, and the other end of the resistor R4 is connected to the PWM end of the dimming module (70) via the diode D1.

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