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At the same time that the LED shines, the LED driver power supply is the guarantee for the development of the LED industry chain. The quality of the LED driver power supply directly affects the reliability of the LED product. Therefore, in the LED industry chain is gradually improving today, the maturity of LED driver power is also crucial. Following the needs of the market, Faith Technology has introduced an electronic load that professionally tests LED drive power to make your test results more accurate and guarantee the quality of your products.
At present, the traditional electronic load on the market cannot meet the test requirements of the LED driving power supply, and voltage and current instability will occur, which is determined by the characteristics of the LED driving power supply itself. The current waveform of the LED driver power supply usually has a large current ripple. For such characteristics, Faith Technology has introduced a single-channel programmable DC electronic load that is professionally tested for LED driver power, the FT6301A and FT6303A. This feature truly simulates the characteristics of LED lights.
First, the classification and characteristics of LED drive power:
1, according to the driving method can be divided into two categories:
(1) Constant current type:
a, the current output of the constant current drive circuit is constant, and the output DC voltage varies within a certain range according to the magnitude of the load resistance. The load resistance is small, the output voltage is low, and the load resistance is larger. The higher the voltage;
b, the constant current circuit is not afraid of load short circuit, but it is forbidden to completely open the load;
c, constant current drive circuit to drive LED is more ideal, but relatively high price;
d. Pay attention to the maximum withstand current and voltage value used, which limits the number of LEDs used.
(2) Voltage regulation:
a. When the parameters in the voltage stabilizing circuit are determined, the output voltage is fixed, and the output current changes as the load increases or decreases;
b, the voltage regulator circuit is not afraid of the load open circuit, but the load is completely prohibited from being completely short-circuited;
c, driving the LED with a voltage-stabilized driving circuit, each string needs to add a suitable resistor to make each string of LED display brightness average;
d. The brightness is affected by the rectified voltage change.
2, according to the circuit structure classification:
(1) Resistor and capacitor step-down mode: By means of capacitor step-down, when flashing, due to the effect of charge and discharge, the instantaneous current through the LED is extremely large, which easily damages the chip. Vulnerable to grid voltage fluctuations, low power efficiency and low reliability;
(2) Resistor step-down mode: through the resistor step-down, the interference caused by the grid voltage change is large, it is not easy to make a regulated power supply, and the step-down resistor consumes a large part of the energy, so this power supply mode has low power efficiency. And the reliability of the system is also low;
(3) The conventional transformer step-down mode: the power supply is small in size, heavy in weight, and the power supply efficiency is also very low, generally only 45% to 60%, so it is rarely used and the reliability is not high;
(4) Step-down mode of electronic transformer: the power supply efficiency is low, the voltage range is not wide, generally 180~240V, and the ripple interference is large;
(5) RCC step-down mode switching power supply: the voltage regulation range is relatively wide, the power supply efficiency is relatively high, generally can be 70% to 80%, and the application is also wide. Since the oscillation frequency of this control mode is discontinuous, the switching frequency is not easy to control, the load voltage ripple coefficient is relatively large, and the abnormal load adaptability is poor;
(6) PWM control mode switching power supply: mainly composed of four parts, input rectification and filtering part, output rectification and filtering part, PWM voltage regulation control part, switching energy conversion part. The basic working principle of PWM switching regulator is that in the case of input voltage, internal parameters and external load changes, the control circuit performs closed-loop feedback by the difference between the control signal and the reference signal to adjust the pulse width of the main circuit switching device. The output voltage or current of the switching power supply is stabilized (ie, the corresponding regulated power supply or constant current power supply). The power supply efficiency is extremely high, generally 80% to 90%, and the output voltage and current are stable. Generally, such circuits have perfect protection measures and are highly reliable power supplies.
Second, Faith single channel programmable DC electronic load FT6301A and FT6303A features:
For the classification and characteristics of LED driver power, here we mainly introduce the steady state test function of FT6301A and FT6303A.
1, constant current test (CC)
In constant current mode, the load always consumes a constant current regardless of the input voltage. The working curve is shown in the figure below.
The constant current mode has two ranges, high and low, which can be switched by panel or SCPI command "SYSTem:MEASure:CURRent". Low range for high input control accuracy and resolution; high range for large input range.
2. Constant voltage test (CV)
In constant voltage mode, the load will consume enough current to maintain the input voltage at the set value. The operating curve is shown above.
The constant voltage mode has two ranges, high and low, which can be switched by panel or SCPI command “SYSTem:MEASure:VOLTageâ€. Low range for high input control accuracy and resolution; high range for large input range.
3. Constant resistance test (CR)
In constant resistance mode, the load is equivalent to a constant resistance, and the input current is linearly adjusted as the input voltage changes. The operating curve is shown below.
4, constant power test (CP)
In constant power mode, the load will consume a constant amount of power. The input current is linearly adjusted as the input voltage changes to ensure that the power consumption is constant. The operating curve is shown above.
Provides protection where equipment may be hosed down or otherwise be very wet, or indoor outdoor applications for full weather protection.
LED drive power professional test equipment FT6301A/FT6303A
In recent years, LED as a new energy-saving light source, can be said to be triumphant, a route to outdoor lighting applications. Compared with traditional lighting products, LED lamps are characterized by energy saving, environmental protection, long life and small size. LED fluorescent tubes are widely used in the market because of their longevity and power saving.