CN202475858U

CN202475858U - Current measurement frequency measurement controller for LED light fixture

Info

Publication number: CN202475858U
Application number: CN2012200126947U
Authority: CN
Inventors: 刘卫东; 吴宏刚; 郑胜吉; 李磊
Original assignee: Second Research Institute of CAAC
Current assignee: Second Research Institute of CAAC
Priority date: 2012-01-12
Filing date: 2012-01-12
Publication date: 2012-10-03
Anticipated expiration: 2022-01-12

Abstract

The utility model discloses a current measurement frequency measurement controller for an LED light fixture, comprising an isolation transformer, a rectification circuit, a constant current voltage stabilizing circuit, an LED drive circuit, a current sampling circuit, a signal conditioning circuit, a signal processor and a frequency signal collection module, wherein the secondary side of the isolation transformer is connected with the input ends of the rectification circuit, the current sampling circuit and the frequency signal collection module; the rectification circuit, the constant current voltage stabilizing circuit and the LED drive current are orderly connected; the current sampling circuit, the signal conditioning circuit, and the signal processor are orderly connected; the frequency signal collection module and the signal processor are orderly connected; and the signal processor is connected with the LED drive circuit. The current measurement frequency measurement controller for an LED light fixture has the beneficial effects that the controller outputs PWM waveforms with different duty ratios through current and frequency detection, and the LED drive circuit controls the light end current of an LED according to PWM waveforms, thereby controlling the brightness of the LED light fixture, and performing aberration-less accurate control on the LED light fixture.

Description

A kind of LED light fixture flow measurement frequency measurement controller

Technical field

The utility model relates to a kind of LED lamp controller, particularly a kind of controller of realizing the LED light fixture is carried out brilliance control through measurement electric current, frequency.

Background technology

The airfield aid photosystem is to ensure aircraft under night, low visibility or other complicated weather condition, the necessary visual navigational aid that takes off normally, lands, slides in the air harbor.The light source of Halogen lamp LED as navigational lighting aid generally adopted on the airport; Light efficiency is low, the life-span is short, easy shortcoming such as damages, develops LED navigational lighting aid system, have efficient height, energy-saving and environmental protection, etc. advantage; Original navigational lighting aid electric power system, and be not suitable for the light control of LED light fixture.

The utility model content

The goal of the invention of the utility model is: to the problem of above-mentioned existence, provide a kind of and realize controller that the LED light fixture is controlled through measuring electric current, frequency.

The technical scheme that the utility model adopts is such: a kind of LED light fixture flow measurement frequency measurement controller; Comprise isolating transformer, rectification circuit, constant current voltage stabilizing circuit, led drive circuit, current sampling circuit, signal conditioning circuit, signal processor and frequency signal acquisition module; Said isolating transformer secondary is connected with the input of rectification circuit, current sampling circuit and frequency signal acquisition module respectively; Said rectification circuit output end is connected with the constant current voltage stabilizing circuit input; The constant current voltage stabilizing circuit output is connected with the led drive circuit input; Said current sampling circuit output is connected with the signal conditioning circuit input, and the output of signal conditioning circuit and said frequency signal acquisition module is connected with the signal processor input respectively, and said signal processor output is connected to the led drive circuit input.

In sum; Owing to adopted technique scheme, the beneficial effect of the utility model is: through detection to electric current and frequency, and the PWM waveform of output different duty; Led drive circuit is different according to the PWM waveform; Control LED lamp end electric current, thereby the brightness of control LED light fixture, realization LED light fixture no color differnece is accurately controlled; Simple in structure, reliability is high, has realized the accurate control to electric current, can realize the control to LED lamp brightness such as airfield runway, taxiways.

Description of drawings

Fig. 1 is the theory diagram of the utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is done detailed explanation.

As shown in Figure 1; A kind of LED light fixture flow measurement frequency measurement controller; Comprise isolating transformer, rectification circuit, constant current voltage stabilizing circuit, led drive circuit, current sampling circuit, signal conditioning circuit, signal processor and frequency signal acquisition module; Said isolating transformer secondary is connected with the input of rectification circuit, current sampling circuit and frequency signal acquisition module respectively; Said rectification circuit output end is connected with the constant current voltage stabilizing circuit input, and the constant current voltage stabilizing circuit output is connected with the led drive circuit input, and said current sampling circuit output is connected with the signal conditioning circuit input; The output of signal conditioning circuit and said frequency signal acquisition module is connected with the signal processor input respectively, and said signal processor output is connected to the led drive circuit input.

In the rectification circuit, adopting rectifier bridge is direct current with the rectification of isolating transformer secondary alternating current.

In the current sampling circuit, the isolating transformer secondary connects current sensor, realizes the transformation of current signal to voltage signal.Signal conditioning circuit carries out the current sensor output voltage that signal amplifies and voltage is moved, with voltage input signal be adjusted into the 0V that signal processor can normally receive～+ voltage signal of 3V.

In the constant current voltage stabilizing circuit,, accomplish current limliting and voltage stabilizing through the effect of three-terminal voltage-stabilizing diode and metal-oxide-semiconductor.

In the led drive circuit, adopt the LED chip for driving, realize the control of LED electric current pinpoint accuracy, this chip has the PWM dimming function, in up to the dimming scope of 3000:1, keeps constant led color.

In the frequency signal Acquisition Circuit, the isolating transformer secondary connects optocoupler, and the employing optocoupler plays the effect of electrical isolation, and the burr in the erasure signal, and the output of optocoupler connects d type flip flop, realizes the Transistor-Transistor Logic level conversion of signal, and plays the effect of frequency division.

Signal processor has the 16 bit timing counter RAM of the FLASH of 1K byte, 2 768B, 1 PWM, 1 tunnel 16 ADC to satisfy the demands.

The ADC of signal processor is converted into digital quantity with the analog signal of signal conditioning circuit output; Simultaneously; Signal processor to frequency division after the output frequency signal of d type flip flop handle; The signal processor software program is analyzed the size of current data and the frequency data that collect, and the duty ratio of pwm signal of output is provided with.

The pwm signal of signal processor output is input in the led drive circuit, through the PWM dimming function of LED chip for driving, realizes the brightness regulation of LED color constancy.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.

Claims

1. LED light fixture flow measurement frequency measurement controller; It is characterized in that: comprise isolating transformer, rectification circuit, constant current voltage stabilizing circuit, led drive circuit, current sampling circuit, signal conditioning circuit, signal processor and frequency signal acquisition module; Said isolating transformer secondary is connected with the input of rectification circuit, current sampling circuit and frequency signal acquisition module respectively; Said rectification circuit output end is connected with the constant current voltage stabilizing circuit input; The constant current voltage stabilizing circuit output is connected with the led drive circuit input; Said current sampling circuit output is connected with the signal conditioning circuit input, and the output of signal conditioning circuit and said frequency signal acquisition module is connected with the signal processor input respectively, and said signal processor output is connected to the led drive circuit input.