PWM type LED street lamp driver capable of saving half electric energy again and dissipating heat

Abstract

The invention discloses a PWM type LED street lamp driver capable of saving half electric energy again and dissipating heat. A core technology is a pulse width adjustable automatic adjustment function or duty cycle adjustable square waves. By designing with a 555 time-base circuit and through changing charge-discharge loop parameters of the 555, the output square waves of the 555 are controlled; by employing the duty cycles of the different output square waves to control work of a field-effect transistor, a voltage output by a pulse transformer is controlled to be high and low, thereby controlling working condition transformation of a street lamp to be dazzling bright and dark bright and realizing an automatic light-adjusting function; with the automatic light-adjusting function, on the basis of energy saving of the street lamp, the energy is saved again for 50% or more; and a path of serial connection manner is adopted by a luminous panel circuit, and a rated current value of a single LED is used for driving the LED street lamp to work to control an LED working temperature of a lamp body to be 50 DEG C or below, so the service life of the LED street lamp is up to fifty thousand hours.

Description

Technical field [0001] The invention relates to a PWM type LED street lamp driver which can save half of the electric energy and can dissipate heat. Background technique [0002] PWM dimming technology is a pulse-width-adjustable power adjustment method. This technology has been successfully applied to power adjustment in electric appliances such as induction cookers and electric bicycles. Its characteristic is that regardless of the adjusted power, the load is always constant. Work under conditions; another feature is that PWM dimming is applied to LED drivers with higher conversion efficiency; street lights on traffic roads, in the period from midnight to dawn, pedestrians and vehicles on the road are scarce, so It is obviously a waste of electric energy that the street lamp is still working brightly; it is also the current LED street lamp on the market. The circuit connection of the light-emitting board is a combination of series and parallel connection. When the power of the ...

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Problems solved by technology

[0002] PWM dimming technology is a pulse width regulation power regulation method. This technology has been successfully applied to the power regulation of electrical appliances such as induction cooker and electric bicycle speed control. work under certain conditions; another feature is that the conversion efficiency of PWM dimming applied to LED drivers is relatively high; for street lights on traffic roads, there are few pedestrians and vehicles on the roads during the time period from midnight to dawn, so that It is obviously a waste of electric energy that the street lamps are still brightly lit; and for the LED street lamps currently on the market, the circuit connections of the light-emitting boards are all connected in series and parallel. The larger the number of roads, the greater the total current value of the street lamp, and the greater the heat generated when the street lamp is working. The heat dissipation problem of LED street lamps has become a major obstacle restricting the development of this technology; in the case of high-power LED lights More than 80% of energy consumption is converted into heat, and only a small part of electrical energy is converted into light energy

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