High-frequency power supply full-bridge inverter circuit open-circuit fault method
A technology of full-bridge inverter circuit and high-frequency power supply, which is applied in continuity testing and other directions, and can solve problems such as hidden dangers of efficient operation of electrostatic precipitators
Pending Publication Date: 2021-01-29
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology
Although the open circuit fault will not directly affect the safety of production, it will also bring hidden dangers to the efficient operation of the electrostatic precipitator. Therefore, in the field of high frequency power supply fault diagnosis, it is necessary to pay attention to the open circuit fault of IGBT switching components.
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[0034] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.
[0035] Such as figure 1 As shown, because the IGBT of the full-bridge inverter circuit of the high-frequency power supply is under different open-circuit fault conditions, the amplitude of the DC component in the output voltage and the phases of the fundamental and even harmonics are different. Therefore, the above two factors can be used as the fault eigenvector of the IGBT and used as the basis for accurate positioning of the open circuit fault of the IGBT.
[0036] High-frequency power supply full-bridge inverter circuit line voltage u 0 Can be expressed as:
[0037] u 0 = u a -u b (1)
[0038] In formula (1): u a , u b It is a two-phase AC voltage.
[0039] The IGBT fault diagnosis method based on double Fourier analysis regards the sinusoidal modulation wave signal and the triangular wave signal as two independent signal...
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The invention relates to a high-frequency power supply full-bridge inverter circuit open-circuit fault method. The method comprises the following steps of: establishing a high-frequency power supply full-bridge inverter circuit voltage expression, measuring A and B two-phase voltages when an IGBT has an open-circuit fault, and calculating an outgoing line voltage; establishing a mathematical expression of a modulated wave; decomposing the voltage of the high-frequency power supply full-bridge inverter circuit and the A-phase voltage and the B-phase voltage into a modulation wave form; obtaining voltage equations of intersection points a and b of the modulated wave and the triangular wave, and obtaining a time function expression of the A-phase voltage of the high-frequency power supply full-bridge inverter circuit; obtaining an output voltage equation of a left bridge arm of the high-frequency power supply full-bridge inverter circuit; obtaining an output voltage equation of a right bridge arm; obtaining a high-frequency power supply full-bridge inverter circuit voltage expression when open-circuit faults of different power components occur; and judging the open-circuit fault of the high-frequency power supply full-bridge inverter circuit according to the magnitude and phase of the direct-current component value and the phase of each harmonic. The method is used for diagnosingthe open-circuit fault of the IGBT switching element in the high-frequency power supply full-bridge inverter circuit module.
Description
technical field [0001] The invention relates to an open-circuit fault method of a full-bridge inverter circuit of a high-frequency power supply, in particular to a method for diagnosing an open-circuit fault of an IGBT switch element in a full-bridge inverter circuit module of a high-frequency power supply by using double Fourier analysis. Background technique [0002] According to the characteristics of high-frequency power supply, the IGBT switching components in the full-bridge inverter circuit module often operate in a high-frequency state, and the voltage applied to both ends of the IGBT switching components and the current flowing during the on-off process overlap in time. This will lead to switching loss, resulting in an increase in the temperature of the IGBT switching components, causing a further increase in the switching loss of the IGBT components, and in severe cases, the entire circuit will be burned. When the IGBT switching components have an open-circuit faul...
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CPCG01R31/54
Inventor 杨沛豪柴琦王小辉寇水潮高峰黄鹏王羚宇贺婷孙梦瑶张立松赵俊博
Owner XIAN THERMAL POWER RES INST CO LTD