Transistor AC power purifying circuit

A technology for AC power supply and circuit purification, applied to AC network circuits, circuit devices, and AC networks to reduce harmonics/ripples, etc., can solve problems such as data loss, computer crashes, and errors in the numerical control system, and achieve flattening mutation waveforms , Eliminate high-frequency interference, improve the effect of power factor

Inactive Publication Date: 2005-10-19
刘正兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of these interferences, data loss, errors, computer crashes, and sound quality degradation of audio equipment in the CNC system are often caused.
The same type of transistor AC power purification circuit that uses sine wave correction for AC power has not yet been seen.

Method used

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  • Transistor AC power purifying circuit
  • Transistor AC power purifying circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The AC power supply is input from L and N through the fuse, and the transformer T is powered on after pressing the power switch K1, and outputs two 15V AC voltages after being stepped down by the transformer, rectified by D5-D8, filtered by the capacitor C43 and stabilized by the integrated voltage stabilizer block U1. After voltage, the first 12V DC voltage is output, which is used for overvoltage, overcurrent and power-on delay startup circuits. The other channel is rectified by D9-D12, filtered by capacitor C47 and regulated by U2 voltage regulator integrated block, and then outputs the second channel of 12V DC voltage, which is used for relays and light-emitting indicating circuits. After starting up, if the AC input voltage is within the normal working range (≤250V), the NE555 time base circuit delays for about 5 seconds and then outputs a low level, the transistor Q29 is cut off, the Q30 is turned on, the relays J1 and J2 are pulled in, and the power supply is puri...

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PUM

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Abstract

This invention relates to a transistor AC power supply purification circuit, in which, a large power rectifying bridge divides a 50Hz AC circuit into positive and negative two half-laps for shaping, the rectification of their waveform is composed of first to fourth level diodes and a capacitor rectification network circuit including two serial diodes in parallel connection with opposite polarity for processing rising and trailing edge voltages separately, each diode is parallel to a capacitor to make up of first level calibration circuit, which gets a positive half-lap of a sine wave from both ends of a large capacitor to be sampled and amplified by a triode to enter into a current or power amplifying level, the output of which is connected with the calibration circuit the waveforms of the positive and negative half-laps are shaped and calibrated and than are composed to a sine wave by a large power rectification bridge.

Description

1. Technical field: [0001] The invention relates to a transistor AC power purifier, which is especially used in low-power occasions to purify and purify AC power, and is used in precision electronic equipment, numerical control equipment, communication equipment, data processing, audio equipment, and precision instruments and meters that require high power supply Wait. 2. Technical background: [0002] The power purification circuit is a relatively commonly used electronic device. With the continuous development of my country's industrial production and the increasing number of civilian electrical appliances, the degree of pollution of the power grid is becoming more and more serious. Many precision electronic devices must use pure AC power. However, common mode control devices are commonly used in the market. The power filter composed of inductance coils and capacitors will also cause the phase shift of the power supply. The existing power supply purification circuit also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/01
CPCY02E40/40
Inventor 刘正兴
Owner 刘正兴
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