Alternating current voltage regulator

Abstract

The invention discloses an alternating current (AC) voltage regulator, comprising an autotransformer and a control circuit, wherein the autotransformer comprises a first coil, a second coil and a third coil which are sequentially wound on an iron core; two ends of the first coil are respectively used as an input end and an output end; one end of the third coil is connected with a zero line, a centre tap is arranged between the third coil and the second coil, a first switch is arranged between the third coil and the second coil, and a second switch is arranged between the zero line and the centre trap; the control circuit is provided with two control signal output ends which are respectively connected with the first switch and the second switch of the autotransformer and respectively output a control signal to control the first switch and the second switch. The voltage regulator has the advantages of small circulating current, low equipment loss and high reliability, the output voltage of the whole equipment can be continuously regulated between 180V and 210V to overcome the shortcoming that the voltage regulation of the traditional transformer only can be controlled by stepping, and the output voltage is pure sine wave without harmonic pollution.

Description

technical field [0001] The invention relates to an AC voltage regulating device, in particular to a voltage stabilizing and voltage regulating device for industrial frequency alternating current suitable for energy-saving lighting and high-precision voltage stabilizing power supply. Background technique [0002] At present, for the voltage regulation of high-power industrial frequency alternating current, the following two methods are generally used to realize it. [0003] The first one is to adjust the output voltage by switching the taps of the transformer. [0004] The main features of this method are: use a power transformer as the main device for output voltage regulation, the transformer has multiple taps, and the taps may be on the live wire or on the neutral wire. Mainly by switching the taps of the transformer to obtain different output voltages. [0005] The second is to adjust the output voltage in a PWM (Pulse Width Modulation, pulse width modulation for short)...

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Problems solved by technology

[0007] Combining the above two methods, although the voltage of the AC can be adjusted, there are still deficiencies. For the first method, the output voltage can only be adjusted in steps, and during the adjustment process, the output voltage is easy to sound mutation

In addition, this method has low voltage regulation accuracy, and the output voltage generally has a deviation of more than 3V.

Products using this method are difficult to apply to occasions that require high output voltage accuracy and voltage change rate

[0008] As for the second method, although its output voltage is continuously adjustable, because it uses power electronic devices as the core, the equipment has harmonic pollution to the power grid; and the products using this method have poor reliability, and because the load current passes through The power electronic devices, so the device has a large operating loss

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