CN211982193U

CN211982193U - Triode switching constant current circuit controlled by 512 signals for outputting short-circuit protection

Info

Publication number: CN211982193U
Application number: CN202020466697.2U
Authority: CN
Inventors: 朱兴成; 廖光裕
Original assignee: Hangzhou Zhongxinli Technology Co ltd
Current assignee: Hangzhou Zhongxinli Intelligent Equipment Co ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2020-11-20
Anticipated expiration: 2030-04-02

Abstract

The utility model discloses an output short-circuit protection's triode switching constant current circuit of 512 signal control, the circuit structure includes AC-DC converter, digital singlechip, triode switching constant current circuit and short-circuit protection circuit, AC-DC converter converts the electric wire netting voltage into the low pressure direct current that the LED lamp needs, then switches the constant current circuit with the triode and is connected, 8 digital singlechip control connection triode switching constant current circuit, triode switching constant current circuit connects LED, this kind of output short-circuit protection's triode switching constant current circuit of 512 signal control realizes low-cost LED control brightening; the power supply integrated control module is used for 512 signal input, and is convenient to apply; the short-circuit protection is provided, the installation and maintenance cost is saved, the power supply, the control and the protection integration are realized, the wiring is simple, and the installation and the use are convenient.

Description

Triode switching constant current circuit controlled by 512 signals for outputting short-circuit protection

Technical Field

The utility model relates to a LED drive power supply field technical field specifically is an output short-circuit protection's 512 signal control's triode switches constant current circuit.

Background

When using LED to realize whole animation effect outdoors, the constant voltage power supply cooperation 512 controller that generally adopts for the LED power supply goes the pointolite of pointolite signal receiving chip, and chip in every LED lamp area, the price is high, and it is not suitable very much to some brightening occasions that do not need too high accuracy, the utility model discloses a whole cluster of power control does not take the LED lamp of chip, adopts the triode to switch and the constant current, because engineering installation, easily causes the input positive negative pole short circuit, has consequently developed triode short circuit protection circuit. Therefore, a triode switching constant current circuit controlled by 512 signals for outputting short-circuit protection is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an output short-circuit protection's 512 signal control's triode switches constant current circuit to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an output short-circuit protection's triode of 512 signal control switches constant current circuit which characterized in that: the LED lamp comprises an AC-DC converter, a digital single chip microcomputer, a triode switching constant current circuit and a short-circuit protection circuit, wherein the AC-DC converter converts the voltage of a power grid into low-voltage direct current required by an LED lamp and then is connected with the triode switching constant current circuit, the input end of the 8-bit digital single chip microcomputer receives 512 signals, the output end of the 8-bit digital single chip microcomputer is connected with the triode switching constant current circuit and used for outputting control signals to the triode switching constant current circuit, and the triode switching constant current circuit is connected with an LED.

Preferably, the triode switching constant current circuit comprises 3 triodes and 3 resistors, wherein the 3 triodes are a triode Q1, a triode Q2 and a triode Q3 respectively, and the 3 resistors are a resistor R1, a resistor R2 and a resistor R3 respectively;

one end of a resistor R1 is connected with the input end of the singlechip, the other end of the resistor R1 is connected with the collector of a triode Q3, the base of the triode Q1 is connected with the collector of a triode Q2, the emitter of a triode Q1 is connected with the base of a triode Q2, and the emitter of the triode Q1 and the base of the triode Q2 are grounded through a resistor R2; the collector of the triode Q1 is connected to the cathode of the LED, the collector of the triode Q1 is connected with the base of the triode Q1 through a resistor R3, the base of the triode Q1 is grounded through a resistor R4, and the emitter of the triode Q3 is grounded.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model can realize the LED control lightening with low cost; the power supply integrated control module is used for 512 signal input, and is convenient to apply; the short-circuit protection is provided, the installation and maintenance cost is saved, the power supply, the control and the protection integration are realized, the wiring is simple, and the installation and the use are convenient.

Drawings

Fig. 1 is a schematic diagram of the circuit structure of the present invention;

FIG. 2 is a schematic diagram of the connection structure of the local single-chip microcomputer of the present invention;

fig. 3 is the schematic diagram of the output structure of the single chip microcomputer of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides an output short-circuit protection's triode of 512 signal control switches constant current circuit which characterized in that: the LED lamp comprises an AC-DC converter, a digital single chip microcomputer, a triode switching constant current circuit and a short-circuit protection circuit, wherein the AC-DC converter converts the voltage of a power grid into low-voltage direct current required by an LED lamp and then is connected with the triode switching constant current circuit, the input end of the 8-bit digital single chip microcomputer receives 512 signals, the output end of the 8-bit digital single chip microcomputer is connected with the triode switching constant current circuit and used for outputting control signals to the triode switching constant current circuit, and the triode switching constant current circuit is connected with an LED.

Preferably, the triode switching constant current circuit comprises 3 triodes and 3 resistors, wherein the 3 triodes are a triode Q1, a triode Q2 and a triode Q3 respectively, and the 3 resistors are a resistor R1, a resistor R2 and a resistor R3 respectively; one end of a resistor R1 is connected with the input end of the singlechip, the other end of the resistor R1 is connected with the collector of a triode Q3, the base of the triode Q1 is connected with the collector of a triode Q2, the emitter of a triode Q1 is connected with the base of a triode Q2, and the emitter of the triode Q1 and the base of the triode Q2 are grounded through a resistor R2; the collector of the triode Q1 is connected to the cathode of the LED, the collector of the triode Q1 is connected with the base of the triode Q1 through a resistor R3, the base of the triode Q1 is grounded through a resistor R4, and the emitter of the triode Q3 is grounded.

Wherein, circuit structure includes: the circuit comprises an AC-DC converter, a digital single chip microcomputer, a triode constant current circuit and a short-circuit protection circuit;

the AC-DC converter converts the power grid voltage into low-voltage direct current required by the LED lamp;

the digital single chip receives 512 signals of the controller, and controls the on and off of the triode to realize the animation effect;

the short-circuit protection circuit protects the triode to be turned off when the output of the triode is short-circuited, and the singlechip drives the triode to have high and low levels, so that the whole string of LED lamps can be controlled to be turned on and off. Because the LED is supplied with low-voltage direct-current constant-voltage, a constant-current control circuit needs to be added on the line of the LED to ensure that the current on the LED lamp string is constant, the anode of the output LED and the cathode of the LED are short-circuited, and at the moment, if protection is not added, the triode can be broken down and damaged, so that a short-circuit protection circuit is needed.

The output of the single chip microcomputer provides driving current for the triode Q1 through the resistor R1, and the triode Q1 is controlled to be switched on and off; by utilizing the characteristic of constant voltage of a BE electrode of the triode, the current when the triode Q1 is conducted flows through the resistor R2, if the voltage on the resistor R2 exceeds the voltage of the pole of the triode Q2BE, the triode Q2 is turned on, after the triode Q2 is turned on, the current on the resistor R1 partially flows onto the triode Q2, the driving current of the triode Q1 is reduced, the current when the triode Q1 flows through the resistor R2 is reduced, the feedback is formed, and the current on the triode Q1 can BE ensured to BE constant.

The short-circuit protection utilizes the conduction of a transistor Q3 during short circuit to fully flow away the current of a resistor R1, so that the transistor Q1 is turned off. As shown in the above figure, if the resistors R3 and R4 are sufficiently large, when the transistor Q1 is turned off, the voltage of the LED cathode approaches to the voltage of the LED anode, and the voltages of the LED anode and the LED cathode are the same when the LED anode and the LED cathode are short-circuited, so to ensure that the transistor Q3 does not malfunction during normal operation and is turned on for protection during short-circuiting, the characteristics of the LED lamp that the LED lamp has a turn-on voltage need to be utilized, and the resistances of the resistor R3 and the resistor R4 are properly selected. The voltage of the LED lamp is 3V when the LED lamp is conducted, and the starting voltage is 2.4-2.8V; and leakage current exists on the LED lamp, or the LED lamp can not be seen to be lighted by human eyes when low current exists, by utilizing the characteristic, when the triode Q1 is turned off in a normal working state due to the value of the resistor R3 and the resistor R4, the leakage current or micro-conduction current on the LED lamp flows through the resistor R3 and the resistor R4, the voltage on the resistor R4 is not enough to turn on the triode Q3, namely the voltage of the LED cathode is lower than that of the LED anode, and when the LED anode and the LED cathode are short-circuited, the voltage divided on the resistor R4 is ensured to be enough to ensure that the triode Q3 is in saturated conduction, and the triode Q1 is turned off, so that the protection effect.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an output short-circuit protection's triode of 512 signal control switches constant current circuit which characterized in that: the LED lamp comprises an AC-DC converter, an 8-bit digital single chip microcomputer, a triode switching constant current circuit and a short-circuit protection circuit, wherein the AC-DC converter converts the voltage of a power grid into low-voltage direct current needed by an LED lamp and then is connected with the triode switching constant current circuit, the input end of the 8-bit digital single chip microcomputer receives 512 signals, the output end of the 8-bit digital single chip microcomputer is connected with the triode switching constant current circuit and used for outputting control signals to the triode switching constant current circuit, and the triode switching constant current circuit is connected with an LED.

2. The output short-circuit protection 512-signal controlled triode switching constant current circuit according to claim 1, wherein: the triode switching constant current circuit comprises 3 triodes and 3 resistors, wherein the 3 triodes are a triode Q1, a triode Q2 and a triode Q3 respectively, and the 3 resistors are a resistor R1, a resistor R2 and a resistor R3 respectively;