LED lamps are widely used in automotive electronics, indoor and outdoor decoration, advertising design and other industries due to their long life, high efficiency, bright colors and fast lighting speed. The rapidly expanding market demand has led to the booming of the entire LED industry chain, and the technical threshold for the production of LED lights has been gradually reduced. A large number of small and medium-sized enterprises have sprung up, and various products have begun to flood the market. After the initial explosive growth, the competition among enterprises has changed from “quantity†to “qualityâ€. The important part of measurement and testing has begun to be valued by many manufacturers.
So, what kind of convenience can RIGOL provide to users in this field? Below we show a series of test and measurement solutions from the research, development, production and application of the LED industry chain.
Figure 1 LED globe light and light bar
LED luminescence characteristics research
Research institutes such as universities, research institutes, and enterprise laboratories related to LEDs often need to study the luminescent properties of LEDs. Two types of equipment are generally required in this study:
· Optical measuring equipment such as integrating spheres, spectrometers, etc.
· Electrical measuring equipment
Figure 2: Research Institute of LED Luminescence Characteristics of a Research Institute
The main function of the electrical measuring device is to provide a stable driving power for the LED lamp and a driving power supply with an arbitrary adjustable driving waveform, and to monitor the driving power supply. In this application field, from the DG3000 signal source of RIGOL, to the current DG5000, it is favored by the majority of users. At present, the widely adopted configuration schemes for engineers are:
· DG5072 function arbitrary waveform generator to provide PWM modulation waveform. This instrument can provide 1uHz ~ 50MHz, duty cycle 0% ~ 100% arbitrarily adjustable PWM drive waveform;
· PA1011 power amplifier for amplifying the PWM signal power to provide a maximum output power of 10W;
· DS2072A digital oscilloscope, mainly used to observe various signal waveforms such as driving
Figure 3 RIGOL DG5000 function arbitrary waveform generator
LED power supply development and production testing
As a traditional industry, the power supply is relatively sound. However, there are some new requirements for the power supply of LED lights, mainly focusing on cost. The cost of LED lamps is much higher than that of ordinary energy-saving lamps, and the lighting beads and heat dissipation cannot be simplified. Therefore, many small and medium-sized enterprises simplify the power supply modules as much as possible. Therefore, how to use the most streamlined solution to make suitable and heat-dissipating LED power modules becomes an important topic.
· In the part of power supply R&D design, RIGOL has designed the “Ultra Power Analyzer†power analysis software for the engineers. With the RIGOL DS4000 digital oscilloscope and voltage and current probes, the overall performance test of the power supply can be completed.
Figure 4 RIGOL power test system and some application sites
· In power supply line testing, user requirements for test equipment are often highlighted in two areas: speed and cost. The speed requirement is mainly caused by the complexity and capacity of the power supply test. It is understood that in the regular power supply line test, the number of items to be tested per product reaches more than 50, so most power supply manufacturers will use automatic Test the system to do the test. In the selection of instruments in the test system, RIGOL's two products are popular for their superior price/performance ratio and excellent stability:
· DM3058E digital multimeter. The main advantages of this product are: 1. Test speed is faster and more stable under the same precision; 2. Use standard VISA interface, easy to integrate, and compatible with mainstream brand command set; 3. As a desktop five and a half multimeter Its market price is only ¥3980.
· DS1000B/Z four-channel digital oscilloscope. This series of products provides the only ultra-high cost performance 4-channel oscilloscope using standard VISA interface, especially DS1000B oscilloscope. Its stability has been favored by power test system integrators for many years.
Figure 5 uses two DS1KZ 8CH power supply test systems
LED power conduction and radiation testing
In the field of LED power testing, there is also a piece of EMC that is well received by users. The country's increasingly strict and standardized EMC legislation and the cost of testing the measurement laboratory have made RIGOL highly praised by users since its first proposal to use the DSA1000 spectrum analyzer for EMI pre-test in 2009.
Figure 6 LED conduction and radiation test site
The introduction of the DSA815 spectrum analyzer greatly reduces the cost of EMI conduction testing that does not require too high a frequency. In the field of LED power supply testing, because there are not many high-frequency devices in itself, engineers often pay more attention to conduction testing. RIGOL has a lot of successful cases and testing experience in this area.
LED application circuit test
At present, LED applications are mainly divided into three parts: lighting, display and decoration. In these applications, remote control and dimming are two extremely important peripheral application circuits. Here we introduce the dimming section first. The dimming of the LED generally controls the brightness and darkness of the plurality of LED lamp beads by controlling the rate of change and the manner of change of the PWM signal, thereby forming a dynamic picture change effect. Most of these customers do not currently test this, but as the customer's requirements increase and the screen is finely controlled, the control signal needs to be tested.
Figure 7: A LED advertising producer laboratory test site
The main technical requirements in this test are:
· multi-channel. Due to a pair of advertisements, one picture is composed of many LEDs. Therefore, multiple tests are required at the same time to observe the timing and change mode of each drive signal.
· Record for a long time. In the design of advertisements, a picture or text change process often lasts for more than 10S. Therefore, in order to record the whole change process, the test instrument needs to have the ability to record accurate waveforms for a long time. Reflecting on the parameters of the instrument requires the instrument to have deep storage function.
Based on the above requirements, MSO4K series oscilloscopes have become the first choice of engineers. They have 16 digital channels with a storage depth of 28Mpts per channel, which can simultaneously and continuously test 16 channels of frequency to 10KHz PWM signal 28S time.
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