Noncontact type measuring system and measuring method for switch power working parameters

Abstract

The invention discloses a measuring system and a measuring method for noncontact type switch power duty factor and switch frequency. The system and method can be used for solving the problem of the traditional measuring method that the efficiency is low because the measured switch power circuit board is needed to be contacted and the insulated circuit board cannot be measured. When the system andmethod are used for measuring, a voltage signal is outputted by irradiating the signal through a magnetic field of a switch power magnetic element (201) coupled with a noncontact magnetic probe (202); the voltage signal is inputted to an amplification processing device (203) and is amplified; and the digital sampling and digital signal treatment are performed on the amplified voltage signal by a signal processing device (204), thereby acquiring the duty factor and switch frequency and finishing the measurement for the switch power working parameters. By using the method and system provided bythe invention, the measured circuit board need not be contacted, the operation is simple, safe and reliable, and the work of the measured circuit is free from being influenced. The method and system provided by the invention can be applied to the field of system test and fault diagnosis of the switch power.

Description

technical field [0001] The invention belongs to the field of testing, and relates to a measuring device and a measuring method, which can be used for non-contact measurement of key working parameters of a step-down switching power supply. Background technique [0002] In the testing process of switching power supply, switching frequency and duty cycle are the key parameters reflecting the working state of switching power supply. The switching power supply uses the pulse width modulation signal as its control signal. During normal operation, it only needs to change the switching frequency or duty cycle of the control signal to realize the control of the output voltage and achieve the purpose of stabilizing the output voltage. In different states, the duty cycle and switching frequency are characterized differently. After measuring and obtaining working parameters such as switching frequency and duty cycle, through analysis and calculation, information such as the working sta...

AI Technical Summary

Problems solved by technology

Automatic test system will reduce reliability due to life problems such as probe wear and poor contact

[0006] Both the manual method and the automatic test method above need to directly contact the switch circuit board. If the circuit board has been treated with insulation protection such as potting, the test node is completely isolated from the outside world and cannot be contacted for measurement.

Images