Step-up/step-down (buck/boost) switching regulator control methods
a switching regulator and control method technology, applied in the direction of power conversion systems, dc-dc conversion, instruments, etc., can solve the problems of increased voltage and current ripple, undesirable behavior, and complicated control functions
Active Publication Date: 2007-12-13
MAXIM INTEGRATED PROD INC
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AI Technical Summary
Benefits of technology
This approach reduces current ripple, maintains low component stress, and enhances conversion efficiency across the entire voltage range without mode changes, delivering approximately 16% greater average current to a load compared to existing methods.
Problems solved by technology
When the voltage ranges of the power source and the load overlap, a common condition in battery powered portable equipment, this control function becomes more complicated.
Existing techniques exhibit such undesirable behaviors as frequency subharmonics, increased voltage and current ripple, mode hunting, reduced conversion efficiency and increased component stress.
Method used
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[0020] A converter in accordance with the present invention is shown in FIG. 2. In such a converter, switches 1 and 4 may be P-channel devices and switches 2 and 3 may be N-channel devices as shown. In that regard, in such converters generally, switches 2 (N1) and 4 (P2) may serve a rectifying function as opposed to a control function, and accordingly, may be realized as conventional diodes, as Schottky diodes or as synchronous rectifiers. Techniques for controlling synchronous rectifiers are well known in the prior art, and accordingly, in order to not obscure the present invention, details of the control of switches 2 (N1) and 4 (P2), if synchronous rectifiers are used, are not repeated herein. Similarly, if on the other hand, diodes such as Schottky diodes are used for switches 2 and 4, the following disclosure will usually ignore the voltage drops across the diodes for circuit analysis purposes. The explanation of the operation of the present invention is still applicable, howev...
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A step-up / step-down switching regulator control method for a regulator having an inductor with first and second leads, a first switch for controllably coupling the first lead to a source of power, a first device between the first lead and a circuit ground, a second switch for controllably coupling the second lead to the circuit ground, and a second device between the second lead and a regulator, the method comprising operating the switches in a sequence of phases when the source of power has a voltage exceeding the regulator output and in the same sequence of phases when the source of power has a voltage less than the regulator output, the phases being phase 1 with the first and second switches closed, phase2 with the first switch closed and the second switch open, and phase 3 with both switches open. The first and second devices may be switches or diodes. Various embodiments are disclosed.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to the field of step-up / step-down switching regulators. [0003] 2. Prior Art [0004] Step-up / step-down switching regulators use pulse width modulation techniques to control the transfer of energy from a power source to a load. When the voltage ranges of the power source and the load overlap, a common condition in battery powered portable equipment, this control function becomes more complicated. Existing techniques exhibit such undesirable behaviors as frequency subharmonics, increased voltage and current ripple, mode hunting, reduced conversion efficiency and increased component stress. By way of example, an H-bridge circuit such as that shown in FIG. 1 can be used as a buck-boost DC to DC converter. Such a converter and method of operation of such a converter is disclosed in U.S. Pat. No. 6,087,816. This system has a large current ripple. The inductor, capacitors and power switches must...
Claims
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IPC IPC(8): G05F1/613
CPCH02M3/1582
Inventor SUMMIT, JEFFREY LEWIS AMRAMMIWA, BRETT A.VOLK, KARL RICHARD
Owner MAXIM INTEGRATED PROD INC