L3_4 - 30 31 RECTIFIER CONTROL The controller usually...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 30 31 RECTIFIER CONTROL The controller usually incorporates the following function: 1) Line synchronization 2) Control of firing angle α 3) Advance limit of angle α 4) Retard limit of angle α 32 33 Cosine wave-crossing control method for a three-phase bridge rectifier 34 The cosine wave-crossing method derives cosine reference wave directly from power supply voltage. The harmonics generated by the converter flow through the line source impedance and distort the line voltage. Similar distortion and transients can be introduced in the system by the power supply itself or by converters operating in parallel. a e b e c e Control system 1 Control system 2 Control system 3 i i i 35 The principle of digital synthesis on a biased cosine wave for a single-phase bridge rectifier using the phase-locked loop (PLL) Phase frequency detector Charge pump Loop filter and amplifier VCO Frequency divider f f*=60Hz f0=30.72 kHz f0= N f N ÷ 9 2 The PLL is essentially a digital feedback system where the reference frequency f* and feedback...
View Full Document

This note was uploaded on 10/05/2011 for the course EECS 101 taught by Professor Hero during the Spring '11 term at National Taipei University.

Page1 / 8

L3_4 - 30 31 RECTIFIER CONTROL The controller usually...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online