CN212413472U

CN212413472U - Dimming LED controller

Info

Publication number: CN212413472U
Application number: CN202020401645.7U
Authority: CN
Inventors: 俞剑峰; 赵鹏远; 王科
Original assignee: Ningbo Self Electronics Co Ltd
Current assignee: Ningbo Self Electronics Co Ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2021-01-26
Anticipated expiration: 2030-03-25

Abstract

The utility model discloses a dimming LED controller, this controller includes the anodal input end of power, power negative pole input end, connects the power module of the anodal input end of power, connects the control module of power module and the switch module who connects control module's signal output part and be used for driving external load, dimming LED controller still includes the short-circuit protection module who gathers the electric signal of external load negative pole, the control module is including connecting the signal receiving terminal of short-circuit protection module, the control module is according to exporting for the electric signal of switch module and receiving come from the electric signal control of short-circuit protection module collection the operating condition of switch module; the utility model discloses can be when the load short circuit, accurate and protect the controller effectively to simple structure, it is with low costs, energy loss is little.

Description

Dimming LED controller

Technical Field

The utility model relates to a power supply unit, especially a LED controller adjusts luminance.

Background

Under the background of energy conservation and environmental protection, the LED lamp is increasingly applied to the fields of household and commercial illumination because of high light emitting efficiency and good light condensing performance. The current dimmable LED lamp controllers in the market mainly comprise two types, one type is without short-circuit protection, although the function is not influenced, the large current caused by the short-circuit condition can burn out the power devices and the like at the rear stage instantly; the other is to select a power device with larger rated current, so that the current flowing by the power supply when in short circuit is smaller than the rated current of the rear-stage power device, but the realization cost of the method is higher, and the use has certain localization.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a dimming LED controller to solve above-mentioned technical problem.

The utility model provides a LED controller adjusts luminance, includes the anodal input of power, power negative pole input, connects the power module of the anodal input of power connects power module's control module and connection control module's signal output part is used for driving the switch module of external load, LED controller adjusts luminance is still including gathering the short-circuit protection module of the signal of telecommunication of external load negative pole, control module is including connecting short-circuit protection module's signal reception end, control module gives according to the output switch module's the signal of telecommunication and receive and come from the signal of telecommunication control that short-circuit protection module gathered switch module's operating condition.

Preferably, the short-circuit protection module includes a first resistor R1, a second resistor R2, and a voltage stabilizing unit, wherein an anode of the voltage stabilizing unit is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the signal receiving end of the control module, one end of the second resistor R2 is connected to the signal receiving end of the control module, and the other end of the second resistor R2 is connected to the negative input end of the power supply.

Preferably, the switching module adopts a MOS transistor Q1 or a triode.

Preferably, the gate of the MOS transistor Q1 is connected to the signal output terminal of the control module, the drain is connected to the negative electrode of the load, and the source is connected to the negative electrode input terminal of the power supply.

Preferably, the voltage stabilizing unit comprises a voltage stabilizing tube D1.

Preferably, the anode of the voltage regulator tube D1 is connected to the first resistor R1, and the cathode is connected to the negative electrode of the external load.

Preferably, the voltage stabilizing unit includes a TL431Q2, a resistor R3 and a resistor R4, the anode of the TL431Q2 is connected to the first resistor R1, the cathode is connected to the negative electrode of the external load, the reference end is connected to one end of the resistor R3 and one end of the resistor R4, the other end of the resistor R3 is connected to the anode of the TL431Q2, and the other end of the resistor R4 is connected to the cathode of the TL431Q 2.

The utility model provides a LED controller output short-circuit protection method adjusts luminance adopts foretell LED controller adjusts luminance, including following step:

001. after the dimming LED controller is connected with a power supply and a load, the dimming LED controller is electrified to work, and the switch module is initialized and closed;

002. the control module controls the switch module to be started, an external load normally works, at the moment, the output of the control module to the switch module is at a high level, and the signal receiving end of the control module is at a low level;

003. when the external load is short-circuited, the voltage of a signal receiving end of the control module is instantly changed into high level, and when the voltage output by the control module to the switch module and the signal receiving end is high level, the control module closes the switch module for a time t;

004. and the control module reopens the switch module, the external load is normal, the step 002 is carried out, and the step 003 is carried out when the external load is short-circuited.

Preferably, 0.5 s.ltoreq.t.ltoreq.3 s.

The technical effects of the utility model:

the utility model discloses a dimming LED controller and output short-circuit protection method thereof can be when the load short circuit, accurate and protect the controller effectively to simple structure, with low costs, energy loss is little.

Drawings

Embodiments of the present invention are described below with reference to the accompanying drawings, in which:

fig. 1 is a frame diagram of the structure of the dimming LED controller of the present invention.

Fig. 2 is a circuit schematic diagram of a dimming LED controller according to an embodiment.

Fig. 3 is a circuit schematic diagram of another embodiment of a dimming LED controller.

Fig. 4 is a block diagram of a flow chart of an output short-circuit protection method of the dimming LED controller of fig. 1.

Detailed Description

The following describes in further detail specific embodiments of the present invention based on the drawings. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.

As shown in fig. 1 and 2, the dimming LED controller of the present embodiment includes a positive power input terminal 100, a negative power input terminal 200, a power supply module 300 connected to the positive power input terminal 100, a control module 400 connected to the power supply module 300, and a switch module 500 connected to a signal output terminal of the control module 400 and used for driving an external load 700.

The power supply positive input terminal 100 and the power supply negative input terminal 200 are used for connecting a power supply, the power supply module 300 and the control module 400 may adopt an existing circuit, and the control module 400 generally adopts a Micro Controller Unit (MCU).

Switch module 500 is used for driving external load 700, the utility model discloses an external load 700 is mainly the LED lamps and lanterns, and in this embodiment, switch module 500 adopts MOS pipe Q1, MOS pipe Q1's gate is connected the negative pole of load is connected to control module 400's signal output part, drain electrode, and the source electrode is connected power negative pole input 200. The on-state voltage of the MOS transistor (field effect transistor) is reduced, the on-state resistance is small, no current is required for gate driving, the loss is small, the driving circuit is simple, the transistor is provided with a protection diode, the thermal resistance characteristic is good, and in another embodiment, the switching module 500 is a triode.

The dimming LED controller of this embodiment further includes a short-circuit protection module 600 for collecting an electrical signal of the negative electrode of the external load 700, the control module 400 includes a signal receiving terminal connected to the short-circuit protection module 600, and the control module 400 controls the operating state of the switch module 500 according to the electrical signal output to the switch module 500 and the electrical signal received from the short-circuit protection module 600. Therefore, when the external load 700 is short-circuited, the voltage signal at the signal receiving end of the control module 400 is changed, so that the control module 400 generates a signal for turning off the switch module 500 to protect the switch module 500, specifically, the control signal is obtained by comparing the electrical signal output to the switch module 500 with the electrical signal received from the short-circuit protection module 600.

The short-circuit protection module 600 of this embodiment includes a first resistor R1, a second resistor R2, and a voltage stabilizing unit 601, wherein an anode of the voltage stabilizing unit 601 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the signal receiving terminal of the control module 400, one end of the second resistor R2 is connected to the signal receiving terminal of the control module 400, and the other end is connected to the negative power input terminal 200. The combined structure is simple, the stability is good, the data acquisition precision is high, and the switch module 500 can be effectively protected.

In this embodiment, the voltage regulator unit 601 includes a voltage regulator tube D1, an anode of the voltage regulator tube D1 is connected to the first resistor R1, and a cathode of the voltage regulator tube D1 is connected to a negative electrode of the external load 700. The voltage-stabilizing tube is convenient to purchase, has multiple models, can meet the requirements and is low in cost.

As shown in fig. 3, in another embodiment, the voltage stabilizing unit 601 includes a TL431Q2, a resistor R3, and a resistor R4, an anode of the TL431Q2 is connected to the first resistor R1, a cathode of the TL431Q2 is connected to a negative electrode of the external load 700, a reference terminal is simultaneously connected to one end of the resistor R3 and one end of the resistor R4, the other end of the resistor R3 is connected to the anode of the TL431Q2, and the other end of the resistor R4 is connected to the cathode of the TL431Q 2. TL431 is a controllable precise voltage-stabilizing source, and a resistor R3 and a resistor R4 are used for adjusting the conduction parameters, can replace a voltage-stabilizing diode, and have higher sampling precision.

As shown in fig. 4, the output short-circuit protection method for the dimming LED controller of the present embodiment adopts the dimming LED controller shown in fig. 1, and includes the following steps:

001. after the dimming LED controller is connected to a power supply and a load, the dimming LED controller is powered on to operate, initialize and close the switch module 500, and set a signal receiving end of the control module 400, and when the control module 400 adopts a micro control unit, it is necessary to set an up-and-down interrupt to the signal receiving end.

002. The control module 400 controls the switch module 500 to be turned on, and the external load 700 normally works, at this time, the output of the control module 400 to the switch module 500 is at a high level, and the signal receiving end of the control module 400 is at a low level;

003. when the external load 700 is short-circuited, the voltage at the signal receiving end of the control module 400 is instantly changed to a high level, and when the voltage output by the control module 400 to the switch module 500 and the signal receiving end are both high levels, the control module 400 turns off the switch module 500 for a time t;

004. the control module 400 turns on the switch module 500 again, and the external load 700 enters step 002 if normal, and enters step 003 if the external load 700 is short-circuited.

In this embodiment, t is greater than or equal to 0.5s and less than or equal to 3s, the time t can be set manually, after a load short circuit is caused by too short time, the switch module 500 is damaged by too frequent switching, and longer time is required for recovering the normal load.

The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, and any modification, equivalent replacement or improvement within the spirit of the present invention is encompassed by the claims of the present invention.

Claims

1. A dimming LED controller comprises a power supply anode input end (100), a power supply cathode input end (200), a power supply module (300) connected with the power supply anode input end (100), a control module (400) connected with the power supply module (300) and a switch module (500) connected with a signal output end of the control module (400) and used for driving an external load (700), characterized in that the dimming LED controller also comprises a short-circuit protection module (600) for collecting the electric signal of the cathode of the external load (700), the control module (400) comprises a signal receiving end connected with the short-circuit protection module (600), the control module (400) controls the working state of the switch module (500) according to the electric signal output to the switch module (500) and the electric signal collected by the short-circuit protection module (600).

2. The dimming LED controller according to claim 1, wherein the short-circuit protection module (600) comprises a first resistor R1, a second resistor R2 and a voltage stabilizing unit (601), wherein a positive electrode of the voltage stabilizing unit (601) is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to the signal receiving end of the control module (400), one end of the second resistor R2 is connected to the signal receiving end of the control module (400), and the other end is connected to the negative power input end (200).

3. The dimming LED controller of claim 1, wherein the switching module (500) employs a MOS transistor Q1 or a triode.

4. The dimming LED controller of claim 3, wherein the MOS transistor Q1 has a gate connected to the signal output of the control module (400), a drain connected to the negative terminal of the load, and a source connected to the negative input terminal (200).

5. The dimming LED controller of claim 2, wherein the voltage regulator unit (601) comprises a voltage regulator tube D1.

6. The dimming LED controller of claim 5, wherein the anode of the voltage regulator D1 is connected to the first resistor R1, and the cathode is connected to the negative terminal of the external load (700).

7. The dimming LED controller according to claim 2, wherein the voltage stabilizing unit (601) comprises a TL431Q2, a resistor R3 and a resistor R4, an anode of the TL431Q2 is connected to the first resistor R1, a cathode of the TL431Q2 is connected to a cathode of the external load (700), a reference terminal is simultaneously connected to one end of the resistor R3 and one end of the resistor R4, the other end of the resistor R3 is connected to the anode of the TL431Q2, and the other end of the resistor R4 is connected to the cathode of the TL431Q 2.