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Switching regulator, and circuit and method for controlling same

A technology of switching circuits and regulators, applied in the direction of adjusting electrical variables, electronic switches, control/regulation systems, etc.

Inactive Publication Date: 2007-06-06
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the NMOS transistor QN1 is disabled, damping noise N may be generated as shown in Figure 2
Similarly, as shown in Figure 3, when using a boost switching regulator similar to the buck switching regulator of Figure 1, damping noise N

Method used

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  • Switching regulator, and circuit and method for controlling same
  • Switching regulator, and circuit and method for controlling same
  • Switching regulator, and circuit and method for controlling same

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Embodiment Construction

[0024] In describing the exemplary embodiments shown in the figures, specific terminology will be employed for the sake of clarity. However, the disclosure of this patent specification is not limited to the specific terms chosen, and it should be understood that each specific element includes all technical equivalents that operate in a similar manner. Exemplary embodiments of switching regulators are now described with reference to FIGS. 4 to 15 , wherein like numerals designate like or corresponding parts throughout the several views. Any of the switching regulators described below is a synchronous switching voltage regulator comprising a pair of switching elements that are turned on and off out of phase with each other. By controlling the operation of the pair of switching elements, the level of the output voltage Vout output to the load 10 coupled with the circuit can be adjusted around the reference level.

[0025] Referring now to FIG. 4, the circuit configuration and op...

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Abstract

A switching regulator includes a first switching element for charging an inductor, a controller circuit for generating a first control signal for controlling the level of an output voltage of the switching regulator, and a reverse current suppressing circuit for controlling the on-resistance of the switching circuit based on whether a reverse current is detected in the switching regulator. A circuit and method for controlling the switching regulator are also disclosed.

Description

technical field [0001] The present invention relates generally to switching regulators, and more particularly to circuits and methods for controlling switching regulators. Background technique [0002] As shown in Figure 1, the switching regulator of the background art includes an input terminal 101; an output terminal 104; an inductor L; a capacitor C; a phase wave modulation (PWM) control including a detector 131, an output driver 132, and a PWM circuit 133 device 130; a P-channel metal oxide semiconductor (PMOS) transistor QP1; an N-channel metal oxide semiconductor (NMOS) transistor QN1; and an error amplifier 140. To preserve high efficiency at light loads, the NMOS transistor QN1 is disabled. For example, the detector 131 monitors the voltage on the node K between the PMOS transistor QP1 and the NMOS transistor QN1. When the voltage on node K starts to rise after its value reaches below ground voltage, NMOS transistor QN1 is disabled. This technique is disclosed, fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M3/156
CPCY02B70/1466H02M3/1588H02M3/1584H02M2001/0045Y02B70/10H02M1/0045H02M3/155H03K17/687
Inventor 小岛真一甲斐寿
Owner RICOH KK