With the continuous improvement and change of electronic power technology in the market, the power technology is also constantly improving, and the power products on the market are all on the street, dazzling. Most customers on the market have very limited ability to control the quality of power products. Some customers will count the number of components, and some will look at the size of the components. Some will choose the specific standard of oven high temperature aging, each has its own statement, in fact, it is not clear, conditional will pay a high salary for a power engineer, but often there will be some unexpected accidents, so today, in view of these problems we see customers, how to choose the power you want? Don't worry. Botu photoelectric for you- together ~ talk is not in place, but also hope more advice ~

The power supply products we see on the market are generally referred to as switching power supply.

switching power supply is the use of modern power electronics technology.control switching tube on and off the time ratio,maintain a stable output voltage of a power supply. switching power supply is generally composed of pulse width modulation (PWM) control IC and MOSFET, constant current powersupply and constant voltage power supply.

So, some friends don'tknow,what is the constant voltage power supply? What is constant current power  supply? 

Constant current power supply: no matter how the load size changes, the output current is

unchanged. If the ammeter series into the load and the voltmeter parallel load measurement, it will be found that the greater the internal resistance of the load, the higher the output voltage, while the ammeter indication unchanged.

Constant voltage powersupply: that is, we often say the voltage regulator power supply. No matter how the load size changes, the output voltage is unchanged. If the ammeter is connected to the load in series and the voltmeter is connected to the load in parallel, it will be found that the greater the internal resistance of the load, the smaller the output current, and the voltmeter indication is unchanged. More detailed it:

The actual constant current power supply is limited by the output voltage range (power range). If the output voltage is lower than the low limit or higher than the high limit due to the change of the load, the power supply will automatically protect or stop the output and alarm, which is what we call immovable or unable to take or flash.

The actual constant voltage power supply is limited by the output current range (power range). If the output current is higher than the rated due to the change of the load, the power supply will automatically protect or stop the output and alarm.