Browse Prior Art Database

Full Bridge Inverter Providing Dual Regulation

IP.com Disclosure Number: IPCOM000087391D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Hoffman, HS: AUTHOR

Abstract

In this power supply, a full bridge inverter is controlled to utilize switching action of one polarity to regulate the main output and that of the other polarity to control another output to more fully utilize the control capability of the inverter switches.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 73% of the total text.

Page 1 of 2

Full Bridge Inverter Providing Dual Regulation

In this power supply, a full bridge inverter is controlled to utilize switching action of one polarity to regulate the main output and that of the other polarity to control another output to more fully utilize the control capability of the inverter switches.

In the circuit of Fig. 1, switches Q1 and Q4 operate as a pair and switches Q2 and Q3 operate as a pair. Timing from oscillator 8 insures that the two pairs are never on together, although both may be off. Feedback 10 from the auxiliary load controls the duty factor of Q2 and Q3. Feedback 12 from the main load controls the duty factor of Q1 and Q4, and, therefore, the flyback energy of L1, which controls the voltage of C and, therefore, the voltage applied to the main load. Q2 and Q3 control the build-up of energy in L2 and, therefore, the auxiliary load voltage. The turns-ratio of L1 must be such as to provide adequate current to C despite the load imposed by L2.

Figs. 2a, 2b, and 2c show portions of the circuit of Fig. 1 which characterize the various phases of the overall cycle of operation: Q1 and Q4 on, all four switches off, and Q2 and Q3 on, respectively. Arrows show current directions during those operation phases.

In Fig. 2a, energy previously stored in C causes current to flow through Q1, the main load and Q4, and also through Q1, winding 20 of L1 and Q4 to charge L1 in parallel with the main load. At the same time, energy previously stored in L2 is del...