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Dc-dc converter, module, power supply device and electronic apparatus

A DC-DC and converter technology, applied in the field of DC-DC converters, modules, power supply units and electronic equipment, can solve the problems of reverse voltage applied by diodes, difficult to suppress recovery current, and difficult to obtain results

Inactive Publication Date: 2012-05-16
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, in the DC-DC converter described in Patent Document 1, when the frequency at which each switch is turned on and off is changed, the timing of the resonant circuit is shifted, and the current does not become zero when the switches are switched, making it difficult to suppress the recovery current. this question
In addition, in the DC-DC converter described in Patent Document 2, there is a problem that a separate power supply for applying a reverse voltage to the diode is required.
In addition, in the DC-DC converter described in Non-Patent Document 1, there is a problem that the inductance connected in series with the Schottky diode prevents the change of the current, and it is difficult to obtain the effect.

Method used

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  • Dc-dc converter, module, power supply device and electronic apparatus
  • Dc-dc converter, module, power supply device and electronic apparatus
  • Dc-dc converter, module, power supply device and electronic apparatus

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Embodiment approach 1

[0036] Hereinafter, the embodiments will be specifically described with reference to the drawings. The DC-DC converter according to the present application is used for a switching power supply or the like that converts a DC input voltage into a power supply voltage when supplying a power supply voltage to an information device or the like. The switching power supply is used as a power source for supplying DC power to electronic devices such as computers. In addition, it is also used as a variable power supply for supplying illuminating lights, audio equipment, microwave ovens, and the like with adjusted power supplies. The switching power supply is also used as a power source for supplying driving power to motors built in washing machines, refrigerators, and air conditioners. The switching power supply is not limited to the case of supplying small power, and can also be used as a power supply for supplying large power to drive motors of vehicles and trams.

[0037] figure 1 It...

Embodiment approach 2

[0058] Figure 5 It is a time chart for explaining the operation of the DC-DC converter 1. The horizontal axis and the vertical axis of each graph represent time and voltage value or current value, respectively. In contrast to the first embodiment, the second switch SW2 and the third switch SW3 are turned on almost simultaneously. In the second embodiment, they are turned on at a predetermined time shift. The control unit CT1 turns on the third switch SW3 after turning on the first switch SW1 and before turning on the second switch SW2. Then, the control unit CT1 turns off the third switch SW3 after the second switch SW2 is turned off and before the first switch SW1 is turned on.

[0059] At the time T1 when the first switch is turned on, the current I1 flows through the first switch SW1, energy is accumulated in the first inductor L1, and the current I1 gradually increases with time. At time T2, the first switch SW1 is turned off, and the current I1 immediately becomes zero. ...

Embodiment approach 3

[0065] Image 6 It is a circuit diagram showing the module. In the third embodiment, a part of the circuit of the first embodiment is modularized. The module has a second switch SW2, a third switch SW3, and a second inductor L2. The source of the second switch SW2 is connected to the terminal A, and is connected to the source of the third switch SW3 via the second inductor L2. The drains of the second switch SW2 and the third switch SW3 are connected to the terminal B. The gates of the second switch SW2 and the third switch SW3 are connected to the terminal C and the terminal D, respectively. By replacing the second switch of the conventional synchronous rectification DC-DC converter with a module, the DC-DC converter 1 can be easily manufactured. In addition, by replacing the second switch of the DC-DC converter of the conventional synchronous rectification method with a module, it can be easily changed to the DC-DC converter 1 of the first and second embodiments.

[0066] ...

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PUM

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Abstract

A controller CT1 switches on a first switch SW1, and the direct-current voltage given from a power source BAT flowing through a first inductor L1 is smoothed by a capacitor C1 and is output from an output terminal OUT1. After a specified period of time has elapsed since the first switch SW1 was turned off by the controller CT1, the second switch SW2 and the third switch SW3 are turned on approximately at the same time. The electric current which was flowing through the first inductor L1 is branched into the second switch SW2 and the third switch SW3, and the electric current flowing through the parasitic diode Dp1 of the second switch SW2 is reduced. As a result, when the second switch SW2 is turned off, the recovery current flowing through the parasitic diode Dp1 is reduced.

Description

Technical field [0001] This application relates to a DC-DC converter, a module, a power supply device, and electronic equipment with little loss. Background technique [0002] Switching power supplies with low conversion loss and easy miniaturization have been used in various fields including electronic devices such as computers. The switching power supply uses a DC-DC converter to convert the input DC voltage into a desired DC voltage and output it as a stabilized power supply voltage. As semiconductor components such as CPUs (Central Processing Units) used in computers have decreased in power supply voltages and increased power consumption, switching power supplies with low voltage and large current output are gradually being used. In view of this, sometimes in the case of outputting a large current, a synchronous rectification type step-down (Buck) converter with less loss is used as a DC-DC converter. [0003] Figure 13 It is a circuit diagram showing a conventional DC-DC con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H01L25/07H01L25/18
CPCH01L25/16H02M3/1588H01L2924/0002Y02B70/1491Y02B70/1466H01L25/115H02M1/34H01L2224/48091H02M2001/342H01L2924/12032H01L2924/1301H01L2924/13091H02M1/342Y02B70/10H01L2924/00014H01L2924/00H01L25/07H01L25/18H02M3/155
Inventor 米泽游出口秀明中岛善康
Owner FUJITSU LTD
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