Although the LED is good at energy saving, but the LED street light source can not directly use the utility grid voltage, it must be equipped with dedicated voltage conversion equipment provided to meet the LED rated voltage and current in order to make LED to work properly, is the so-called LED high bay power supply. what is a led light bulb?

what is a led light bulb with different power supply?However, due to a variety of different LED power performance, so choose a suitable, efficient LED special power supply, can be truly revealing the high performance characteristics of the LED light source. Because of the low efficiency of the LED power supply needs to consume a lot of power, will not be able to highlight the energy-saving characteristics of the LED to the LED-powered.

LED power supply according to driving methods can be divided into two categories:
A constant current drive circuit driving the Led Spotlight is very satisfactory, the drawback is that higher prices. The constant current circuit although not afraid of the load short-circuit, but is prohibited to load completely open. what is a led light bulb?
To limit the number of LED use, because it has the largest withstand current and voltage values. A voltage regulator circuit to determine all the parameters, the output is a fixed voltage, output current changes with the changes in load.

Second, the led bulb manufacturer power circuit structure can be divided into six categories:
The conventional step-down transformer:
The advantage of this power is small, the downside is the weight of emphasis, the power efficiency is very low, generally 45% to 60%, reliability is not high, so rarely.
Electronic step-down transformer:
The power structure of the inadequacies of conversion efficiency is low, narrow voltage range, generally 180 ~ 240V ripple interference.

The PWM control switching power supply:
At present, the LED power supply of the PWM control mode is ideal, because this switching power supply output voltage or current is very stable. what is a led light bulb? High power conversion efficiency can generally be as high as 80% to 90%, and the output voltage and current is very stable. LED power of this approach consists of four parts are: part of the input rectifier filter, the filter portion of the output rectifier, PWM regulator control section, the switching energy conversion part. Protection measures, such circuits are well belong to the high reliability of power supply.

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Switching power supply type:
Modern switching power supply, there are two: one is the DC switching power supply; the other is the AC switching power supply. The following Peng Chau Electronics Engineers introduces the DC switching power supplies, dc switching power supply function is poor power quality of the original eco-power (coarse) - such as mains power or battery power, converted to meet the equipment requirements of high quality DC voltage (Varitronix). The core of the DC switching power supply DC / DC converter. DC switching power supply classification is dependent on the classification of DC / DC converter. In other words, the classification of the classification of the DC switching power supply and DC / DC converter is the classification of essentially the same, the DC / DC converter is basically a classification of the DC switching power supply.

DC / DC converter between the input and output electrical isolation can be divided into two categories: one is isolated called isolated DC / DC converter; the other is not isolated as non-isolated DC / DC converter. Isolated DC / DC converter can also be classified by the number of active power devices. The single tube of DC / DC converter Forward (Forward), Flyback (Flyback) two. The double-barreled double-barreled DC / DC converter Forward (DoubelTransistor Forward Converter), twin-tube flyback (the Double Transistr F1yback Converter), Push-Pull (Push the Pull Converter) and half-bridge (Half-Bridge Converter) four. Four DC / DC converter is the full-bridge DC / DC converter (Full-Bridge Converter).

Non-isolated DC / DC converter, according to the number of active power devices can be divided into single-tube, double pipe, and four three categories. Single tube to a total of six of the DC / DC converter, step-down (Buck) DC / DC converter, step-up (Boost) DC / DC converters, DC / DC converter, boost buck (Buck Boost) device of Cuk the DC / DC converter, the Zeta DC / DC converter and SEPIC, the DC / DC converter. DC / DC converters, the Buck and Boost type DC / DC converter is the basic buck-boost of Cuk, Zeta, SEPIC, type DC / DC converter is derived from a single tube in this six. The twin-tube cascaded double-barreled boost (buck-boost) DC / DC converter DC / DC converter. Four DC / DC converter is used, the full-bridge DC / DC converter (Full-Bridge Converter).

Isolated DC / DC converter input and output electrical isolation is usually transformer to achieve the function of the transformer has a transformer, so conducive to the expansion of the converter output range of applications, but also easy to achieve different voltage output , or a variety of the same voltage output.

Power switch voltage and current rating, the converter's output power is usually proportional to the number of switch. The more the number of switch, the greater the output power of the DC / DC converter, four type than the two output power is twice as large, single-tube output power of only four 1/4.

A combination of non-isolated converters and isolated converters can be a single converter does not have their own characteristics.

Energy transmission points, one-way transmission and two-way transmission of two DC / DC converter. DC / DC converter with bi-directional transmission function, either side of the transmission power from the power of lateral load power from the load-lateral side of the transmission power.

DC / DC converter can be divided into self-excited and separately controlled. With the positive feedback signal converter to switch to self-sustaining periodic switching converter, called self-excited converter, such as the the Luo Yeer (Royer,) converter is a typical push-pull self-oscillating converter. Controlled DC / DC converter switching device control signal is generated by specialized external control circuit.
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