Power supply is one of the key components for all kind of electrical or electronic devices. No matter in compact 3C devices, such as mobile phones or MP3 players, or in huge electrical driving equipment, power supply takes the main role of electric energy regulation and distribution. Many test and measurement instruments are needed in design, debugging and produce power supplies.
Power IC test
Power semiconductor component is the core of energy conversion device, whether it is MOSFET or IGBT, Power IC take the function of power conversion and adjustment. The energy loss of power devices is an important factor that affects the overall efficiency of the power supply, high loss will lead to heat generation of the device and may affect the life of the power supply. By using oscilloscope, engineers can use instantaneous power integral method to measure the loss of power device, Power loss can be obtained by the instantaneous variation of the waveform and the total energy loss. RIGOL oscilloscopes can support power testing in all applications, full range of high voltage differential and current probes can meet all kinds of test requirements. The PC version of UltraPower Analysis software can perform variety of parameters test online or offline, export test result, and generate reports.
Output ripple test
Power ripple is an important parameter to evaluate DC power supply. Ripple is composed of AC frequency ripple, switching ripple and high frequency noise. The accuracy of ripple result requires that the noise of measure instrument should be as small as possible, the test system error should be kept at the lowest level. An important feature of the RIGOL oscilloscope is the low noise, DS2000A oscilloscope can provide 500uV/div of the industry's leading small range, it is very suitable for testing power supply ripple. The RP2200 probe provides 1:1/10:1 two attenuation ratio, which can be directly used for ripple testing. UltraPower Analysis software provide dedicated ripple analysis function.
In order to improve the efficiency of power supply, switching mode power supply adopt AFPC circuit, the gate driving pulse width need to be modulated. In invertor driving system design, Bipolar PWM driving pulse is also required for simulation, testing and verification. RIGOL various arbitrary waveform generator can produce a variety of pulse width modulation signal, dual channel output, two channels are completely isolated, especially suitable for all kinds of driving signal simulation. The measurement trend plot function of the oscilloscope can be used to analysis variation of the modulated signal.
Production and Aging test
Power supply products need to complete the large quantities of rapid parameter test and aging test, these tests need to be made at the same time and plenty parameters need to be recoded. For test results that exceed the limits, the system needs a warning. All of these requirements can be easily completed by RIGOL M300 data acquisition system. 6.5 digital resolution, up to 250CH/s test speed and the highest 320 channel system configuration capability make M300 become the ideal tool for production test, temperature and humidity test and aging test. Large screen display and intuitive PC software make M300 easy to use.
EMI protest and diagnosis
As an important source of EMI, the power supply’s EMI performance need to be verified in the first place. With the increase of the switching frequency of power devices, the problem of EMI is also more serious. The influence of power supply to grid is also become serious with high working condition. RIGOL spectrum analyzer provide EMI analysis option, by using near-field probe and LISN, complete electronic product radiation and conduction test can be made. Near field probe can be used to locate and isolated EMI problem. Engineers could make rectification before EMC certification test to save time and testing costs.