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Led flashlight dimming program and the potential for market growth

 

With the sustained and rapid development of CREE FLASHLIGHT application market, the continued expansion of the range of applications has also led to the continuous improvement of the product requirements, the led bicycle lights end products on the led bicycle lights brightness adjustment This feature also is very necessary. Is also such as led bicycle lights lamps and displays must focus on the link.

    Today, Led flashlight has surely become a mainstream technology. The technology has matured, one of the signs is Led flashlight standards and norms have been put forward. Stringent efficiency requirements already exist for quite some time, and will continue to improve. But Recently, Led flashlight designer's work more difficult, because to meet the following two requirements: both use dimmers for incandescent dimming control, but also to achieve high power factor performance cree flashlight brightness adjustment is divided into analog dimming and PWM dimming, the following led torch dimming will be introduced.

    Dimming is a very common feature of the lighting system. For incandescent lamps, which can be easily achieved at low cost? The dimming of the led torch lights but there is a certain difficulty in the transition to Led flashlight for architects and residential users do not want to lose the dimming control should have advantages. This involves knowledge of Led flashlight class.

The power factor is very important factor, because the high power factor can reduce the loss of the distribution network. Reduce the use of electricity to the environmental impact of the most effective way to reduce waste, and regulatory agencies around the world are further strict power factor specification. One example is the Energy Star solid-state lighting energy efficiency specifications (09/12/07), which provides residential lighting products, power factor (PF) should be greater than 0.7, commercial lighting products, power factor (PF) should be greater than 0.9.

    The dimming of the cree flashlight lamps the most important, there are three, the dimming skills of these three changes in the led torch drive current input to the dimmer. In accordance with the different circuit systems can also be divided into imitate dimming and PWM dimming.

    The first: This dimming method is accomplished by modulating the led bicycle lights drive current to the led bicycle lights lights dimming the brightness of the led torch chip led bicycle lights drive current to a certain proportion of stakeholders, so we adjust the led torch drive current can control the led bicycle lights light light and dark.

    The second: This dimming method is called to imitate the methods of dimming or linear dimming method. The dimming method has the advantage: when the drive current linear growth or decrease, reducing the drive current overshoot in the life of the cree flashlight chip, and the anti-dimming circuit nuisance. Its shortcomings are the size of the drive current process of change is certainly has some influence on the color temperature of the led torch chip.

    Third: This dimming method is called pulse width modulation (PWM). The ways is to adjust the drive current was square wave, variable pulse width after modulation shift of the pulse width modulated led torch lights continuously lit, also changed the input power, in order to reach the energy-saving, and dimming goals. Frequency with the usual about 200Hz ~ 10KHz; because the human eye visual lag, do not feel the phenomenon of light shine in the dimming process. The benefits of the method of this dimming thermal performance, the defects could improve the led bicycle lights drive current overshoot certainly has some influence on the life of the cree flashlight chip.

    In general, the analog dimming is usually very simple to implement. However, due to the characteristics of the led torch light to the average drive current offset. For monochromatic led bicycle lights, the wavelength change. For white led torch, the correlated color temperature (CCT) will change. PWM dimming guarantees color of the cree flashlight designers need. PWM dimming can also increase the output current accuracy. Linear adjustment of the analog dimming light will reduce the accuracy of the output current. Generally speaking, the light output compared to analog dimming and PWM dimming accuracy than the linear control.

    From the energy, are not comparable. PWM is to ensure that the current measured CCT and color (light intensity), the analog dimming is not this premise. If you want to sacrifice this premise is to consider energy-efficient, the measured data. It is estimated that in the circumstances to achieve the same illumination, the PWM will be advantage.

    From the response time of the dimming, the PWM dims due to its fast response speed and the ability to more accurately dimming. The most widely applied in actual use.

    If led flashlight controller circuit dimming or secondary is side of the dimming way. The simple line dimming is the forefront of SCR controller. This is the most commonly used lighting control, but unfortunately, the use of SCR controller when the dimming of the led bicycle lights produce a large number of problems. The more advanced line dimmer Electronic Frontier or trailing is edge dimmers. The secondary side of the electronic control is dimmers for professional lighting systems.

SCR controller in the incandescent performance is impeccable, but the led torch lights will produce a variety of negative effects, including flashing, uneven luminous, audio noise and flashing. To ascertain the reasons, one must first understand the working principle of the SCR dimmer.

The application can be seen from the above description, if the controller can not only perform power factor correction, but also the implementation of the constant current drive and phase angle detection, the design of isolated and non-isolated cree flashlight driver can The types of dimming controller to achieve stability. Also enables the circuit to meet all international standards of efficiency, power factor, harmonics and EMI requirements. In the past, incandescent light bulbs must be manufactured for a specific supply voltage. Now, but do not have to be limited, dimmable cree flashlight lamps can be manufactured without any modification and universal around the world.

 

 

Led flashlight dimming program and the potential for market growth

With the sustained and rapid development of CREE FLASHLIGHT application market, the continued expansion of the range of applications has also led to the continuous improvement of the product requirements, the led bicycle lights end products on the led bicycle lights brightness adjustment This feature also is very necessary. Is also such as led bicycle lights lamps and displays must focus on the link.

    Today, Led flashlight has surely become a mainstream technology. The technology has matured, one of the signs is Led flashlight standards and norms have been put forward. Stringent efficiency requirements already exist for quite some time, and will continue to improve. But Recently, Led flashlight designer's work more difficult, because to meet the following two requirements: both use dimmers for incandescent dimming control, but also to achieve high power factor performance cree flashlight brightness adjustment is divided into analog dimming and PWM dimming, the following led torch dimming will be introduced.

    Dimming is a very common feature of the lighting system. For incandescent lamps, which can be easily achieved at low cost? The dimming of the led torch lights but there is a certain difficulty in the transition to Led flashlight for architects and residential users do not want to lose the dimming control should have advantages. This involves knowledge of Led flashlight class.

The power factor is very important factor, because the high power factor can reduce the loss of the distribution network. Reduce the use of electricity to the environmental impact of the most effective way to reduce waste, and regulatory agencies around the world are further strict power factor specification. One example is the Energy Star solid-state lighting energy efficiency specifications (09/12/07), which provides residential lighting products, power factor (PF) should be greater than 0.7, commercial lighting products, power factor (PF) should be greater than 0.9.

    The dimming of the cree flashlight lamps the most important, there are three, the dimming skills of these three changes in the led torch drive current input to the dimmer. In accordance with the different circuit systems can also be divided into imitate dimming and PWM dimming.

    The first: This dimming method is accomplished by modulating the led bicycle lights drive current to the led bicycle lights lights dimming the brightness of the led torch chip led bicycle lights drive current to a certain proportion of stakeholders, so we adjust the led torch drive current can control the led bicycle lights light light and dark.

    The second: This dimming method is called to imitate the methods of dimming or linear dimming method. The dimming method has the advantage: when the drive current linear growth or decrease, reducing the drive current overshoot in the life of the cree flashlight chip, and the anti-dimming circuit nuisance. Its shortcomings are the size of the drive current process of change is certainly has some influence on the color temperature of the led torch chip.

    Third: This dimming method is called pulse width modulation (PWM). The ways is to adjust the drive current was square wave, variable pulse width after modulation shift of the pulse width modulated led torch lights continuously lit, also changed the input power, in order to reach the energy-saving, and dimming goals. Frequency with the usual about 200Hz ~ 10KHz; because the human eye visual lag, do not feel the phenomenon of light shine in the dimming process. The benefits of the method of this dimming thermal performance, the defects could improve the led bicycle lights drive current overshoot certainly has some influence on the life of the cree flashlight chip.

    In general, the analog dimming is usually very simple to implement. However, due to the characteristics of the led torch light to the average drive current offset. For monochromatic led bicycle lights, the wavelength change. For white led torch, the correlated color temperature (CCT) will change. PWM dimming guarantees color of the cree flashlight designers need. PWM dimming can also increase the output current accuracy. Linear adjustment of the analog dimming light will reduce the accuracy of the output current. Generally speaking, the light output compared to analog dimming and PWM dimming accuracy than the linear control.

    From the energy, are not comparable. PWM is to ensure that the current measured CCT and color (light intensity), the analog dimming is not this premise. If you want to sacrifice this premise is to consider energy-efficient, the measured data. It is estimated that in the circumstances to achieve the same illumination, the PWM will be advantage.

    From the response time of the dimming, the PWM dims due to its fast response speed and the ability to more accurately dimming. The most widely applied in actual use.

    If led flashlight controller circuit dimming or secondary is side of the dimming way. The simple line dimming is the forefront of SCR controller. This is the most commonly used lighting control, but unfortunately, the use of SCR controller when the dimming of the led bicycle lights produce a large number of problems. The more advanced line dimmer Electronic Frontier or trailing is edge dimmers. The secondary side of the electronic control is dimmers for professional lighting systems.

SCR controller in the incandescent performance is impeccable, but the led torch lights will produce a variety of negative effects, including flashing, uneven luminous, audio noise and flashing. To ascertain the reasons, one must first understand the working principle of the SCR dimmer.

The application can be seen from the above description, if the controller can not only perform power factor correction, but also the implementation of the constant current drive and phase angle detection, the design of isolated and non-isolated cree flashlight driver can The types of dimming controller to achieve stability. Also enables the circuit to meet all international standards of efficiency, power factor, harmonics and EMI requirements. In the past, incandescent light bulbs must be manufactured for a specific supply voltage. Now, but do not have to be limited, dimmable cree flashlight lamps can be manufactured without any modification and universal around the world.

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