Power-on current-limiting circuit and application circuit of power-on current-limiting circuit

Abstract

The invention discloses a power-on current-limiting circuit and an application circuit of the power-on current-limiting circuit. The input end of the power-on current-limiting circuit is connected with one end of the primary side of a transformer and the positive electrode of the output end of a relay respectively, and the other end of the primary side of the transformer is connected with the negative electrode of the output end of the relay so as to form the output end of the power-on current-limiting circuit; a resonant capacitor and a resonant resistor are in bridge connection with the secondary side of the transformer; a first power diode is in reverse connection with the input end of the relay; and the positive electrode of the input end of the relay and the cathode of the first power diode are respectively connected with a control power supply, and the negative electrode of the input end of the relay is connected with the anode of the first power diode so as to form the control terminal of the power-on current-limiting circuit. The power-on current-limiting circuit and the application circuit are simple in structures, are convenient to control, can be matched with a three-phase diode rectifier, a single-phase diode rectifier, a three-phase IGBT (insulated gate bipolar transistor) controlled rectifier and a single-phase IGBT controlled rectifier, and can be laid on an alternating current side or a direct current side and widely applied to all power electronic convertors, the power-on current is adjustable, the power-on effect is good, the current displacement factor is always 1, and the service life of an electrolytic capacitor is long.

Description

technical field [0001] The invention relates to a device in the technical field of power electronic converters, in particular to a power-on current limiting circuit and an application circuit thereof. Background technique [0002] The power electronic conversion device powered by single-phase AC power supply can be used in application fields such as switching power supply, high-power inverter, active power factor corrector (APFC), among them, for high-power power factor corrector (PFC), including single The phase diode does not control the rectifier bridge and boost circuit. For high-power applications, the energy storage capacitor on the output side of the boost circuit has a large capacity, and the initial voltage of the energy storage capacitor is zero. When the single-phase AC power supply is powered on when the energy storage capacitor is at zero voltage, a high-amplitude inrush current will be generated, resulting in adverse results: causing the air switch to operate ...

AI Technical Summary

Problems solved by technology

The problem with the first two methods is: the secondary current impact problem is brought about when the resistance is cut off

The problem with the latter method is that it is only suitable for applications where the load power is less than 200W

[0004] After searching the existing technology, it was found that Zhang Xiangjun et al., "Journal of Electrical Machinery and Control". June 2011. Summarized two traditional soft-start circuits, including the first two methods mentioned above, and proposed "a start-up surge current Suppression circuit", that is, a three-stage inrush current suppression circuit, which can effectively suppress the primary inrush current and the secondary inrush current at start-up, but there is still an inrush current, and the harmonic current impact on the power grid is relatively serious, and the structure is complex. The number of components is large, the control is not easy, the power-on process is uncontrollable, the current waveform is asymmetrical during the power-on process, and the reactive power is large

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