Browse Prior Art Database

Free Running Bridge Inverter

IP.com Disclosure Number: IPCOM000092937D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Baumann, DD: AUTHOR

Abstract

This circuit converts a low DC voltage into AC. Either transistors Q1 and Q4 or transistors Q2 and Q3 conduct at any one time. When Q1 and Q4 conduct, current flows through primary N1 from point 10 to point 12. The voltage across N1 is +12 volts minus the collector saturation voltage of Q1 and Q4.

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Free Running Bridge Inverter

This circuit converts a low DC voltage into AC. Either transistors Q1 and Q4 or transistors Q2 and Q3 conduct at any one time. When Q1 and Q4 conduct, current flows through primary N1 from point 10 to point 12. The voltage across N1 is +12 volts minus the collector saturation voltage of Q1 and Q4.

When the current of either Q1 and Q4 reaches the collector saturation current, regenerative switching occurs. This turns them off and turns Q2 and Q3 on, causing the voltage in primary N1 to reverse. When the current reaches the saturation current of Q2 or Q3, regenerative switching occurs once again and the cycle repeats itself.

The square wave of voltage induced in secondary N2 has a peak-to-peak amplitude equal to 2 x 12 x (N2/N1) and can be rectified to produce DC at a voltage equal to 12 x N2/N1. The frequency of operation is determined primarily by the inductance of N1, the load on N2, the supply voltage and the maximum available collector current.

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