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Dc-dc converter and switching control circuit

A technology for switching control circuits and driving circuits, applied in circuits, electronic switches, servo meter circuits, etc., can solve problems such as the adverse effects of surrounding circuits, and achieve the effect of reducing peak noise

Active Publication Date: 2010-10-13
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventionally, in DC-DC converters of the switching regulator type, it is known that spike noises are generated due to the on / off operation of switching elements
This spike noise causes common mode noise and adversely affects surrounding circuits

Method used

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  • Dc-dc converter and switching control circuit
  • Dc-dc converter and switching control circuit
  • Dc-dc converter and switching control circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0028] figure 1 An embodiment of a switching regulator type DC-DC converter to which the present invention is applied is shown.

[0029] The DC-DC converter of this embodiment includes: a coil L1 as an inductor; A drive switching transistor M1 composed of a trench MOSFET (insulated gate field effect transistor), and a rectification switching transistor M2 composed of an N-channel MOSFET connected between the one terminal of the coil L1 and the ground.

[0030] In addition, the DC-DC converter includes: a switch control circuit 20 for turning on and off the switching transistors M1 and M2; and a filter connected between the other terminal (output terminal OUT) of the coil L1 and a ground point. Capacitor C1.

[0031] Although not particularly limited, in this embodiment, among the elements constituting the DC-DC converter, the switch control circuit 20 is f...

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PUM

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Abstract

The invention provides the technique of reducing peak noise in a DC-DC converter in the manner of a switching regulator. In the DC-DC converter which is provided with the switching regulator having a driving switching element (M1) for driving the current to pass through an inducer, a rectification element (M2) and a filter capacitor connected to an output terminal, at least a driving signal of a drive circuit (DRV1) is generated for conducting or stopping the driving switching element (M1), wherein a transition time (tf1) of the drive signal in which the driving switching element (M1) shifts from an off state to an on state becomes longer than a transition time (tr1) of the drive signal in which the driving switching element (M1) shifts from the on state to the off state.

Description

technical field [0001] The present invention relates to a switching regulator type DC-DC converter for converting direct current voltage and its switching control circuit, and more particularly to a device effective for reducing spike noise accompanying switching operations in a synchronous rectification type DC-DC converter technology. Background technique [0002] As a circuit that converts an input DC voltage to output a DC voltage of a different potential, there is a switching regulator type DC-DC converter. In the DC-DC converter, as image 3 As shown, there is a synchronous rectification type DC-DC converter that applies a DC power supply voltage Vin supplied from a DC power source such as a battery to an inductor (coil) L1 to allow a current to flow to store energy in the coil. the switching element M1; the rectifying switching element M2 which rectifies the current of the coil during the energy release period when the driving switching element is turned off. This s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCY02B70/1466H02M3/1588H02M1/44H02M2001/0029Y02B70/10H02M1/0029H02H7/1213H02M1/36H02M3/156H02M7/064H03K17/0822H03K17/22F15B2211/328
Inventor 佐藤朗川越治
Owner MITSUMI ELECTRIC CO LTD