LED drive power professional test equipment FT6301A/FT6303A

In recent years, led as a new energy-saving light source, can be said to be a route to stride forward singing militant songs, outdoor indoor lighting applications. Compared with the traditional lighting products, LED lamp has the characteristics of energy saving, environmental protection, long life, small size, and so on. The LED fluorescent tube is widely used in the market because of its life and power saving. In LED shine at the same time, the LED driver is the development of LED industrial chain security, LED drive power supply quality directly affects the reliability of LED products. Therefore, in the LED industry chain gradually improved today, LED driver power is also critical to maturity. With the needs of the market, we have launched a professional test of LED drive power supply of electronic load, so that your test results more accurate, to ensure the quality of your products.

Currently on the market of traditional electronic load can not meet the test requirements of LED drive power, voltage and current will appear the phenomenon of instability, which is driven by the LED characteristics of the power supply itself of the decision. The current waveform of LED drive power output usually has large current ripple, according to this characteristic, the single channel fee Si technology launched a professional testing LED driver programmable DC electronic load: FT6301A and FT6303A. The function can truly simulate the characteristics of LED lamps.

The classification and characteristics of power supply, a LED driver: 1, the drive can be divided into two categories: (1): a constant current, constant current drive circuit output current is constant, while the output DC voltage is different with the size of the load resistance in a certain range, the load resistance is small. The output voltage is low, the greater the load resistance, the output voltage is higher; B, constant fear load short circuit, but the non load fully open; C, constant current drive circuit LED is ideal, but relatively higher prices; D, should be noted that the use of the maximum withstand voltage and current it limits the number of values, the use of LED. (2): A, when the voltage regulator to determine the parameters in the circuit, the output voltage is fixed, while the output current but increase or decrease with load change; B, voltage regulator circuits are not afraid of open load, but not completely C, to load short circuit; voltage drive circuit driver LED, each series of needs with an appropriate resistor can make each string of LED luminance average; D, brightness voltage changes by the rectifier to influence. 2, according to the classification of circuit structure: (1) resistor, capacitor step-down way: through the capacitor step-down, when used in the flashing, because the role of charge and discharge, the instantaneous current through the LED extremely easy to damage the chip. Is easily affected by the voltage fluctuation of the power grid, power supply reliability and low efficiency is low; (2) resistance step-down way: through the resistance step-down voltage change of the power line interference, it is difficult to make power supply, reducing resistance to consume very much energy, so that the supply side power efficiency is very low, and the system is reliable low; (3) the conventional transformer step-down approach: power small, too much weight, power efficiency is very low, only 45% ~ 60%, so seldom used, the reliability is not high; (4) electronic transformer step-down approach: power efficiency in low voltage range is not wide, generally 180 ~ 240V, ripple interference; (5) RCC step-down switching power supply: voltage range is wide, the power efficiency is relatively high, the general can do 70% to 80%, as well as wide application. Because of the oscillation frequency of the control mode is not continuous, the switching frequency is not easy to control, load voltage ripple coefficient is relatively large, abnormal load adaptability; (6): PWM control of switching power supply is mainly composed of four parts, input rectifier filter and output rectifier filter, PWM regulator control part, switch part of energy conversion. The basic principle of PWM switching regulator is the input voltage, the internal parameters and external load changes, the closed-loop feedback control circuit is controlled by the difference between the signal and the reference signal, regulating main circuit switching device turn the pulse width, the output voltage or current stable switching power supply (i.e. the corresponding power supply or constant current power supply). Power efficiency is very high, generally can do 80% ~ 90%, output voltage, current stability. Generally, this kind of circuit has perfect protective measures. Faith two, single channel programmable DC electronic load FT6301A and FT6303A function: according to the classification and characteristics of LED drive power, here introduces the steady state test function of FT6301A and FT6303A 1, constant current test (CC) constant current mode, no matter how the change in input voltage, load current always the consumption of a constant working curve, as shown below. Constant current mode has high and low two range, can be switched through the panel or SCPI command "SYSTem:MEASure:CURRent". Low range can achieve high input control accuracy and resolution; high range can achieve large input range.

2, constant voltage test (CV) constant voltage mode, the load will consume enough current to maintain the input voltage at the set value, the working curve as shown above. Constant voltage mode has a high and low two range, can be switched through the panel or SCPI command "SYSTem:MEASure:VOLTage". Low range can achieve high input control accuracy and resolution; high range can achieve large input range. 3, constant resistance test (CR) constant resistance mode, the load is equivalent to a constant resistance, the input current will vary linearly with the input voltage, the working curve as shown in the following figure.

4, constant power test (CP) constant power mode,