Single pulse distribution triggered three-phase controllable silicon circuit

Abstract

The invention provides a three-phase silicon controlled rectifier circuit with single-pulse distribution and triggering, relating to a silicon controlled rectifier excitation device of a three-phase synchronous motor rotor. The circuit comprises a synchronous circuit, a pulse forming circuit, and a pulse distribution circuit. The synchronous circuit mainly comprises three paths of synchronous signal acquisition circuits corresponding to a three-phrase power supply, and each circuit is composed of a resistor, diodes and voltage stabilizing tubes that are connected in series. The pulse forming circuit mainly comprises a PNP transistor (BG201), a uni-junction transistor (BG202), and a capacitor (C205). The pulse distribution circuit comprises an integrated module (MF-01). The invention is characterized in that the circuit realizes automatic tracking of trigger pulse through the simple synchronous circuit, the pulse forming circuit and the pulse distribution circuit instead of three-phase sinusoidal wave synthesis, so that the three-phase power supply can randomly connected without phase recognition. The circuit is very simple, and the required elements are less (1 / 10 of conventional circuit), so that the control circuit has small volume and low cost.

Description

technical field [0001] The invention relates to the field of three-phase synchronous motors, in particular to a single-pulse distribution triggering three-phase thyristor circuit used in a rotor thyristor excitation device. Background technique [0002] In the rotor of a three-phase synchronous motor, the thyristor excitation device generally uses a three-phase bridge semi-controlled thyristor rectifier circuit (main bridge) as the main circuit, while the synchronization, trigger pulse circuit, phase-shifting circuit, and excitation control circuit etc. form the control circuit. The main circuit directly supplies the excitation current to the rotor winding, and the control circuit completes the control of the excitation time, synchronous pulse, phase shift and constant voltage of the entire excitation device. Usually, the three-phase bridge-type half-controlled silicon-controlled rectifier circuit must be triggered by three trigger pulses to work normally. Controlled silic...

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Problems solved by technology

Otherwise, the thyristor element may be damaged at the moment of power-on

[0005] 3. Due to the above reasons, a large number of electronic components are required, which increases the size of the circuit board, requires a lot of manpower, and occupies a large volume in the device, resulting in an increase in the cost of the device.

[0006] 4. Due to the high complexity of the circuit and the high difficulty of debugging, there are also requirements for debugging personnel and debugging equipment

However, the parameters in actual use are all about 60% of the rated output, otherwise it will cause the out-of-step of the synchronous motor

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