CN105848355A

CN105848355A - LED drive circuit capable of realizing multiple output mode setting via code dialing board

Info

Publication number: CN105848355A
Application number: CN201610320640.XA
Authority: CN
Inventors: 贵彬力; 戴红
Original assignee: SHANGHAI ARCATA ELECTRONIC Inc
Current assignee: SHANGHAI ARCATA ELECTRONIC Inc
Priority date: 2016-05-16
Filing date: 2016-05-16
Publication date: 2016-08-10
Anticipated expiration: 2036-05-16
Also published as: CN105848355B

Abstract

The invention provides an LED drive circuit capable of realizing multiple output mode setting via a code dialing board. The LED drive circuit comprises an emergency driven LED circuit and a mains supply driven LED circuit, wherein the emergency driven LED circuit is powered via batteries, existence of alternating mains supply is detected via a one-chip microcomputer, and condition of the emergency driven LED circuit and condition of the mains supply driven LED circuit are controlled via on-off of a bidirectional silicon controlled rectifier; an LED output current, or LED output power or battery capacity and battery discharge time are set via a BCD code dialing board by the emergency driven LED circuit; codes of the BCD code dialing board correspond to a set output current, or a set output power value or set battery capacity and set battery discharge time; the corresponding codes are sent to the one-chip microcomputer via the BCD code dialing board, the one-chip microcomputer outputs modulated pulses of different duty ratios according to the codes of the BCD code dialing board and sends the same to a DC-DC direct current conversion circuit, and an aim of LED lamp multistage light modulation can be achieved.

Description

The LED drive circuit that multiple output mode is arranged is realized by dial-up dish

Technical field

The present invention relates to LED lighting engineering, in particular at privileged place, under powering-off state, it is desirable to have should Anxious illumination, i.e. has battery powered illumination or a kind of LED drives and needs user to arrange multiple current output mode voluntarily LED drives.

Background technology

In the LED place being provided with emergency lighting, need also exist for multiple in the case of LED current output arrange, output Power setting, arranges function discharge time, and existing technology is difficult to the function accomplishing to meet above-mentioned setting, and most of producers are general Being the corresponding single output electric current of single product or single power, also having some is to regulate output electric current by outer meeting resistance, Setting up in a word is very trouble, the LED driving of current emergency lighting LED or multi output, uses DIP switch, By the switch of 1-8 position, group upper, group lower coding, and need comparison description to adjust, easily dial the wrong number.Efficiency is low, error rate Height, and multiple output mode is arranged underaction, there is no uniqueness.

Summary of the invention

For solving the problem of aforementioned existence, the present invention provides a kind of and realizes what multiple output mode was arranged by dial-up dish LED drive circuit, including emergency driving LED circuit, city's electric drive LED circuit, emergency driving LED circuit battery is powered, by The presence or absence of single-chip microcomputer detection electric main, is turned on and off with bidirectional triode thyristor, controls in emergency driving LED or city's electric drive LED state, described emergency driving LED circuit, the output electric current of LED, or output are set with BCD dial-up dish, or battery holds Amount and battery discharge time, the coding of BCD dial-up dish, the corresponding output current value set, or output power value, or battery capacity And battery discharge time, the code of described correspondence delivered to single-chip microcomputer by BCD dial-up dish, and single-chip microcomputer is according to the coding of BCD dial-up dish, defeated Go out the modulation pulse of different duty, deliver to DC-DC DC transfer circuit, reach LED multistage light modulation purpose.

Described BCD dial-up dish is made up of A dial-up dish and B dial-up dish, has 1-10 class on A code-disc, each class Corresponding class number × 100 milliampere of code, have two class on B dish: 0,5, each class correspondence class number × 10 milliampere.

The code of described dial-up dish, is decimal scale or binary system.

It is an advantage of the invention that light modulation precision is high, minimum light modulation electric current can reach 50 milliamperes, and dial-up dish is simple and clear, Clear directly perceived, no mistake could arise.

Accompanying drawing explanation

Fig. 1 is the block diagram of the present invention

Fig. 2 is that Single-chip Controlling is operated in emergency driving LED power or the flow chart of city's electric drive LED power

Accompanying drawing 3 is the A dial-up dish and B dial-up dial scale schematic diagram indicated with electric current

Accompanying drawing 4 is the A dial-up dish and B dial-up dial scale schematic diagram indicated with power

Accompanying drawing 5 is the A dial-up dish and B dial-up dial scale schematic diagram indicated the capacity with battery and discharge time.

Detailed description of the invention

Embodiment 1

Dial-up dish indicates, with electric current, the current value that LED is wanted, and binary-coded decimal dish coding is as shown in the table:

Radix-minus-one complement can also be used to realize, or upset coding.

The output current value corresponding to code that single-chip microcomputer inputs according to binary-coded decimal dish, calculates output PWM pulse, delivers to DC-DC change-over circuit, DC-DC change-over circuit controls the output electric current of LED.

Single-chip microcomputer calculates the dutycycle of PWM as the following formula:

If to export mutually to the electric current of LED is 100 milliamperes, then the dutycycle of PWM is:

If wanting, exporting electric current is 1000mA, then dial-up dish A, B position of rotation is as shown in Figure 3:

Output electric current=A dish points to numeral X100+B dish and points to numeral X10

Output electric current=the 10X100+0X10=1000mA of upper figure.

Embodiment 2

If requiring, output indicates with power, identical with the aforementioned coding with electric current sign, as shown in the table with the code that power indicates:

With power indicate code-disc as shown in Figure 4.

The output current value corresponding to code that single-chip microcomputer inputs according to binary-coded decimal dish, calculates output PWM pulse, delivers to DC-DC change-over circuit, DC-DC change-over circuit controls the light modulation of LED.

The voltage of LED is to be obtained by single chip computer measurement, and in order to measure conveniently, therefore general DC-DC needs to use boost type to open up Flutter structure.

After powering on, single-chip microcomputer first exports minimum 5% dutycycle.After measuring LED voltage, by the merit of user's sets itself Rate calculates PWM duty cycle.

Such as user designs 18W, LED voltage be 30W, DC-DC maximum output current be 1050mA

So dutycycle=(18/30)/1050=57.1%.

Embodiment 3

If requiring to press the capacity of battery and discharge time indicating, the code of code-disc is as shown in the table:

Code-disc is as shown in Figure 5.

0.9 is coefficient, and cell voltage is battery nominal voltage, and efficiency is drive efficiency, and the time is the time that left figure is arranged, 90 Minutes corresponding 1.5,120 minutes corresponding 2, the LED voltage measured was lamp load voltage, and maximum output current is that driving can carry The maximum current of confession.

Assume selection is 9.6V/3000mAH battery, discharges 90 minutes.LED measurement to voltage be 30V.

The A dish class that accompanying drawing 5 is is 900 milliamperes, 1000 milliamperes, 1200 milliamperes, 1500 milliamperes, 1800 milliamperes, 2000 millis Peace, 2200 milliamperes, 2500 milliamperes, 3000 milliamperes, 6000 milliamperes.

B dish be 90 minutes and 120 minutes two grades.

Claims

1. realize, by dial-up dish, the LED drive circuit that multiple output mode is arranged, including emergency driving LED circuit, city Electric drive LED circuit, emergency driving LED circuit battery is powered, it is characterised in that by having of single-chip microcomputer detection electric main Nothing, is turned on and off with bidirectional triode thyristor, controls at emergency driving LED or city's electric drive LED state, described emergency driving LED Circuit, arranges the output electric current of LED, or output with BCD dial-up dish, or battery capacity and battery discharge time, BCD dial-up The coding of dish, the corresponding output current value set, or output power value, or battery capacity and battery discharge time, BCD dial-up dish The code of described correspondence is delivered to single-chip microcomputer, and single-chip microcomputer, according to the coding of BCD dial-up dish, exports the modulation pulse of different duty, Deliver to DC-DC DC transfer circuit, reach LED multistage light modulation purpose.

2. the LED drive circuit being realized the setting of multiple output mode by dial-up dish as described in claim 1, its feature exists In, described BCD dial-up dish is made up of A dial-up dish and B dial-up dish, has 1-10 class on A code-disc, and the code of each class is corresponding Class number × 100 milliampere, have two class on B dish: 0,5, each class correspondence class number × 10 milliampere.

3. the LED drive circuit being realized the setting of multiple output mode by dial-up dish as described in claim 1, its feature exists In, the code of described dial-up dish, is decimal scale or binary system.