Synchronous control method of 3 phase AC solid power controller

Abstract

A synchronous control method of a three-phase alternating current solid-state power controller belongs to the control method of the alternating current solid-state power controllers. The method adopts a 'slow turn-on and slow turn-off mode' to control the turn-on and the turn-off of the three-phase alternating current solid-state power controller, each phase utilizes the reverse serial connection of two power field effect transistors to control the turn-on and the turn-off of a load, when the power field effect transistors are controlled to be turned on, gate-source voltage of the power filed effect transistors is controlled to be slowly increased, thereby causing on-resistance of the power filed effect transistors to be gradually reduced and further realizing the slow turn-on; when the power filed effect transistors are controlled to be turned off, the gate-source voltage of the power filed effect transistors is controlled to be gradually decreased to threshold voltage of the power filed effect transistors, the power field effect transistors are gradually increased and gradually transited to a full turn-off state, thereby realizing the slow turn-off; the method can not only realize the synchronous turn-on and the turn-off of the three phases and can improve the power supply quality, but can also inhibit switch instantaneous du / dt and di / dt, reduce the complexity of a control circuit and reduce the size and the weight, thereby being applicable to a power supply system with arbitrary working frequency.

Description

Technical field: [0001] The invention relates to a control method of a three-phase AC solid-state power controller, which belongs to the control method of the AC solid-state power controller in the field of power electronics and electric technology. Background technique: [0002] The solid-state power controller came into being based on the development of the aircraft power distribution system. It refers to a solid-state component that is used to replace the conversion function of the relay and the circuit protection function of the circuit breaker. It is a control device that matches the solid-state power distribution system. Switching device for switching on and off the load. It has the advantages of no contact, no arc, no noise, fast response, small electromagnetic interference, long life, high reliability, and easy computer remote control. have a wide range of applications. [0003] In order to reduce the surge current and peak voltage caused by du / dt and di / dt when th...

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Problems solved by technology

[0004] (1) The control method of "zero voltage on, zero current off" is complex, requiring current zero-crossing detection, voltage zero-crossing detection, logic judgment and other circuits, which increases the volume and weight of the AC solid-state power controller

[0005] (3) The AC solid-state power controller is used in three-phase occasions. When the control method of "zero voltage on, zero current off" is adopted, due to the phase difference between the three phases such as figure 1 shown, t 1 and t 2 Indicates the transition time required for turn-on and turn-off. There is at least a 120° phase difference between the earliest turn-on phase or turn-off phase and the last turn-on phase or turn-off phase, so the three-phase turn-on and turn-off will not be synchronized, which may affect Normal operation of three-phase load

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