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AC power source stable feedback method

A technology for stable power supply and AC power, applied in the direction of adjusting electrical variables, measuring electrical variables, measuring devices, etc., can solve problems such as damage to power supply, oscillation, and power supply malfunction.

Inactive Publication Date: 2004-07-21
HANGZHOU JINGDA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional communication and feedback methods can often only satisfy one of them
At the same time, under different loads, different phase shifts are generated. When positive feedback occurs, oscillation will occur, causing the power supply to malfunction, and even damage the power supply in severe cases.

Method used

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Embodiment Construction

[0006] It is based on the principle that the sine wave function Asin(Φ+θ 0 ), whose waveform is determined by A and θ in the function 0 Decide.

[0007] The method is: first, the signal source has a DC reference corresponding to the required voltage (or current) amplitude and a sine wave sin(Φ+θ 1 ) consists of two parts. The AC signal fed back is divided into two channels. One channel obtains the amplitude of the output signal through AC-DC conversion. It is input to an integrator at the same time as the DC signal source (opposite polarity). When the two DC signals are equal, The integral is in equilibrium (no longer charging or discharging), which stabilizes the dc reference (modulo A) with respect to magnitude.

[0008] The AC signal fed back is phase-detected with the AC part of the signal source, and the phase difference (duty cycle, square wave amplitude can be stabilized), which is opposite to the set DC polarity, is input to another integrator at the same time, and i...

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Abstract

The present invnetion discloses one stable feedback method in AC power source. The signal source consists of two parts of a DC reference corresponding to the amplitude of the voltage and current and a sine wave with set module 1. The feedbacked AC signal is divided into two paths. One path is for AC / DC convertion to obtain the amplitude of the output signal. The amplitude and one DC signal are fed to one integrator. When the amplitude is equal to the DC signal, the integrator is in balance to obtain the stable module A. The other path is for phase detection through comparing with the AC part of source signal to obtain a phase difference, which is fed to other integrator to obtain output controlling an active phase shifter. By regulating the on-off state of a VMOS FET, an AC signal and a DC signal after feedback are obtained and synthesized before fed to a power amplifier. The voltage sampling is performed through capacitor.

Description

technical field [0001] The invention relates to a stable feedback method for an AC power supply. Background technique [0002] Traditional communication and feedback methods can often only satisfy one of them. At the same time, under different loads, different phase shifts are generated. When positive feedback occurs, oscillation will occur, causing the power supply to fail to work, and even damage the power supply in severe cases. Contents of the invention [0003] The present invention provides a kind of AC power supply stable feedback method, and its first signal source has the DC reference corresponding to required voltage or current amplitude and the sine wave sin(Φ+θ 1 ) consists of two parts. The AC signal fed back is divided into two channels. One channel obtains the amplitude of the output signal through AC-DC conversion. It is input to an integrator at the same time as the DC signal source. When the two DC sign...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00G05F1/12
Inventor 杜吉全
Owner HANGZHOU JINGDA ELECTRONICS