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Digital phase-shift circuit and improved AC (Alternating Current) power source thereof

A technology of digital phase shifting and AC power supply, which is applied in the direction of converting AC power input to AC power output, converting AC power input to DC power output, and electrical components, etc. It can solve problems such as output waveform distortion, circuit complexity, and input power interference. , to achieve the effects of small DC ripple, improved application reliability, and high reliability

Active Publication Date: 2012-06-13
SHANGHAI XIBANG ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a digital phase-shifting circuit and its improved AC power supply, which is based on large-scale programmable logic chip control and adopts special DDS synthesis waveform technology for sine wave frequency modulation and voltage modulation AC power supply, which solves the current problem The voltage-regulated and frequency-regulated power supply uses the output waveform distortion of the thyristor voltage regulating circuit, and the frequency can only be adjusted in a small range, which will interfere with the input power supply and the circuit is complicated.

Method used

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  • Digital phase-shift circuit and improved AC (Alternating Current) power source thereof
  • Digital phase-shift circuit and improved AC (Alternating Current) power source thereof
  • Digital phase-shift circuit and improved AC (Alternating Current) power source thereof

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Embodiment 1

[0031] like figure 1 As shown, the digital phase shifting circuit involved in this embodiment includes: a counting trigger frequency division unit, a short circuit pulse counting unit and an overcurrent pulse counting unit, wherein: the output of the counting trigger frequency division unit is connected to the AC-DC voltage regulation circuit and The control information required by the driving circuit is transmitted, and the short-circuit pulse counting unit and the over-current pulse counting unit are respectively connected with the AC-DC voltage regulating circuit and transmit protection and control information.

[0032] The counting trigger frequency division unit includes: four counting trigger subunits, a total counter, a (PWM) pulse width modulator and a 61m module, wherein: the input terminal of the total counter and the external signal cudn, cuup respectively form or The gate, the pulse width modulator and the input terminal of the 61m module all receive the clock sign...

Embodiment 2

[0041] like figure 2 As shown, it is an improved AC power supply involved in this embodiment, including: a main circuit and a control circuit connected to the main circuit and transmitting working status and control instructions, wherein:

[0042] The main circuit includes: an input filter, an AC-DC voltage regulating circuit, a DC filter, a DC-AC converter and an output filter connected in sequence;

[0043] The control loop includes: a frequency conversion trigger circuit, a human-computer interaction module, and the above-mentioned digital phase-shifting circuit, wherein: the output end of the input filter circuit is connected to the input end of the AC-DC voltage regulating circuit, and the high-frequency harmonics of the power grid are filtered out At the same time, it prevents the harmonics generated by the circuit from being transmitted to the power grid. The input end of the digital phase shifting circuit is connected to the human-computer interaction module and recei...

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Abstract

The invention discloses a digital phase-shift circuit in the technical field of a power system. The digital phase-shift circuit comprises a counting, triggering and frequency dividing unit, a short circuit pulse counting unit and an over-current pulse counting unit. An improved AC power source including the digital phase-shift circuit comprises a main loop and a control loop which is connected with the main loop and transmits a work state and a control command; the main loop comprises an input filter, an AC-DC voltage adjusting circuit, a DC filter, a DC-AC converter and an output filter, allof which are connected sequentially; and the control loop comprises a variable frequency trigger circuit, a man-machine interaction module and the digital phase-shift circuit according to any one of claims 1 to 3. The digital phase-shift circuit, disclosed by the invention, solves the problems of output waveform distortion, small frequency adjustment range, influence to input power source, complex circuit and the like of the conventional voltage adjusting and frequency adjusting power source which adopts a thyristor voltage adjusting circuit.

Description

technical field [0001] The invention relates to a device in the field of power system technology, in particular to a digital phase shifting circuit and its improved AC power supply. Background technique [0002] At present, the voltage regulation of AC power supply is mainly realized by the thyristor, and the output waveform of the thyristor is generally distorted in the process of AC voltage regulation, and the harmonic interference is serious. The reason is that the control pole of the thyristor can only Trigger conduction, and after conduction, only when the current of the thyristor is less than the minimum value for maintaining conduction can it be shut down in the AC power supply and automatically shut down at zero crossing. [0003] Due to the low frequency, it is difficult to deal with sine wave AC power. Therefore, the thyristor can only adjust the voltage of the sine wave AC power supply by triggering the conduction in the corresponding phase angle, which leads to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/00H02M5/453H02M7/5387
Inventor 袁康蒋国庆
Owner SHANGHAI XIBANG ELECTRIC
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