Capacitive type shared ground AC/DC switch voltage stabilizing circuit

Abstract

The invention discloses a capacitive type shared ground AC / DC switch voltage stabilizing circuit achieving the purpose that an input alternating current and an output direct current share the ground. An electric field is directly utilized for converting the alternating current into the direct current, and the electromagnetic conversion process is reduced. Although an electric reactor composed an inductor is used for restraining the current, the energy for carrying out electromagnetic conversion is small compared with a transformer of an existing switching power source and an existing energy storage inductor, and therefore the voltage stabilizing circuit has the advantages of being simple in structure, small in size, high in power and power coefficient and the like. The anti-jamming and anti-lightning stroke capabilities of the power source are improved, the electromagnetic radiation is small, the electromagnetic radiation interference is resisted, and the power supply quality is improved. The device can take the basic grounding measure to prevent electromagnetic pulse interference, the voltage stabilizing circuit can serve as a drive power source of a highway LED lighting lamp, and the electromagnetic pulse interference and lightning can be effectively avoided.

Description

technical field [0001] The invention relates to a converter in the field of electrotechnical technology, in particular to a capacitive common-ground AC / DC switching voltage stabilizing circuit. In particular, it relates to a common-ground rectification and voltage stabilization circuit for alternating current by using power electronic technology to control capacitors. Background technique [0002] With the popularization of electronic equipment, direct current is more and more widely used because it is easier to control and has higher precision than alternating current. Because most of the load power supply is AC power supply, to realize DC power supply, the AC power must be rectified and stabilized. Existing AC rectification and voltage stabilization circuits can be divided into switching voltage stabilization circuits and linear voltage stabilization circuits. Compared with linear voltage stabilization circuits, switching voltage stabilization circuits have the advantages...

AI Technical Summary

Problems solved by technology

However, due to the use of electromagnetic coupling transformers for voltage transformation and voltage regulation, multiple electromagnetic conversions are required, which reduces the conversion efficiency, and there is electromagnetic radiation during electromagnetic conversion, which seriously affects the power quality of the grid and equipment.

The chopper circuit of the patent application (200810210209.5) is only suitable for DC / DC DC voltage conversion, and the conversion circuit consists of at least two switching devices to form a branch circuit, which has complex structure, large loss and low efficiency

Although the patent application (200710156313.6) realizes capacitive AC / DC conversion, it has the disadvantages of using too many switching devices and that the input AC and output DC cannot share the same ground

The patent application (201310495516.3) adopts capacitive voltage divider rectification, which has many advantages compared with the existing switching power supply circuit, but due to the restriction of the rectifier bridge, the output circuit and the input AC circuit cannot share the same ground, and the grounding is to prevent electromagnetic pulses and lightning strikes The basic measures of interference reduce the anti-interference and anti-lightning ability of the circuit, and there are certain safety hazards, which cannot meet the requirements of some electrical equipment

Furthermore, inside the rectifier bridge, the rectification of the positive and negative half cycles requires current to flow through two rectifier diodes. The tube voltage drop generated when the current flows through the diodes will generate a loss of 1.4V-2V, accounting for about 1% of the overall circuit loss. %-10%, resulting in waste of electric energy

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