Triggering energy-saving device and thyristor switch

Abstract

The invention relates to a triggering energy-saving device and a thyristor switch, which belong to the field of electric switches. The triggering energy-saving device comprises a voltage detecting circuit and an electronic switch, wherein a control end of the electronic switch is connected with an output end of the voltage detecting circuit, the electronic switch is serially connected in a triggering return circuit of a thyristor to be controlled, and an input end of the voltage detecting circuit is connected with the thyristor. The thyristor is triggered to be connected under the condition that voltage values at two ends of the thyristor are larger than connecting voltage drop of the thyristor, and after the thyristor is connected, the thyristor is turned off to trigger control signals, so that the triggering energy-saving device has the advantages of extremely low triggering energy consumption and high reliability. The triggering energy-saving device comprises the thyristor switch, and since thyristors are low in triggering and driving energy consumption, frequency and duty ratio of pulse signals of a triggering transformer can be increased, or output signals of the triggering transformer are transmitted to control ends of the thyristors via the triggering energy-saving device by means of rectification and stored energy of a capacitor. The thyristor switch has the advantages of extremely low operating energy consumption, good linearity and high reliability.

Description

technical field [0001] The trigger energy-saving device and the thyristor switch of the present invention belong to the field of electric switches, in particular a trigger energy-saving device suitable for use in the thyristor switch trigger circuit triggered by a transformer and a trigger energy saving device with extremely low energy consumption, good linearity, and small and reliable generation of harmonics high performance thyristor switches. Background technique [0002] At present, in the power system that requires frequent switching of loads, thyristor switches are widely used to switch resistive, inductive or capacitive loads. Use direct current to trigger the conduction of the thyristor, but use the control circuit to provide a continuous pulse trigger signal through the trigger transformer to trigger the conduction of the thyristor (see attached figure 1 As shown), in order to consider the energy consumption of the control circuit and the trigger transformer will ...

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Problems solved by technology

[0002] At present, in the power system that requires frequent switching of loads, thyristor switches are widely used to switch resistive, inductive or capacitive loads. Use direct current to trigger the conduction of the thyristor, but use the control circuit to provide a continuous pulse trigger signal through the trigger transformer to trigger the conduction of the thyristor (see attached figure 1 As shown), in order to consider the energy consumption of the control circuit and the trigger transformer will not be saturated under high-frequency and high-current working conditions for a long time, it is generally designed to work under the condition of a pulse width of about 30 microseconds and a duty ratio of 1 / 3 , calculated according to 30 microseconds: 1.414×380×SIN (2×3.14×50×0.00003×2)=10V, it can be seen that in the 380V / 50HZ AC voltage system, the voltage at both ends of the thyristor should be 10V Only left and right can be reliably triggered (note: this has a certain degree of randomness), which makes the output current waveform of the thyristor poor in linearity and will generate large harmonic pollution. With the conditions for triggering conduction, the triggering transformer still needs to provide continuous triggering signals to the control mode of the thyristor (note: once the thyristor is triggered to conduct, the triggering signal can be completely turned off, and the triggering time only needs to be in microseconds). The necessary waste of energy consumption makes the control circuit have the disadvantages of large power supply capacity, increased volume, and large heat generation, and electronic components that work for a long time under high-frequency, high-current, and high-temperature conditions are also prone to aging and damage

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