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DC-DC converter and switching control circuit

一种开关控制电路、驱动电路的技术，应用在电路、电子开关、伺服计电路等方向，能够解决周围电路不良影响等问题，达到减小尖峰噪声的效果

Active Publication Date: 2014-07-02
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
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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 that drives the switching transistors M1 and M2 to be turned on and off; and a filter connected between the other terminal (output terminal OUT) of the coil L1 and the ground. Capacitor C1.

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

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PUM

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Abstract

The present invention provides a technique capable of reducing spike noise in a switching regulator type DC-DC converter. In a switching regulator type DC-DC converter having a driving switching element (M1) for passing current through an inductor, a rectifying element (M2), and a smoothing capacitor connected to an output terminal, at least a pair of driving switches is generated. The drive circuit (DRV1) of the drive signal for the on / off drive of the element (M1) generates the drive signal as follows: that is, the transition of the drive signal when the switching element for driving is shifted from the on state to the off state The transition time (tf1) of the driving signal when the driving switching element is shifted from the off state to the on state is longer than the time (tr1).

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 Patents(China)
IPC IPC(8): H02M3/155
CPCH02M2001/0029Y02B70/1466H02M1/44H02M3/1588Y02B70/10H02M1/0029H02H7/1213H02M1/36H02M3/156H02M7/064H03K17/0822H03K17/22F15B2211/328
Inventor 佐藤朗川越治
Owner MITSUMI ELECTRIC CO LTD