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DC/DC converter

A DC converter and conversion technology, applied in the direction of converting DC power input to DC power output, instruments, conversion equipment without intermediate conversion to AC, etc., can solve the problem of increasing the load of the output transistor and the load, and undershoot without any consideration And other issues

Inactive Publication Date: 2005-03-09
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the DC-DC converter generates an excessive output current "io" even after the output voltage Vo has reached the terminal voltage Va (or a constant reference voltage Voref), which may cause an overshoot in the output voltage Vo
This overshoot of the output voltage Vo must be prevented or reduced as much as possible, because not only when its peak level exceeds the constant reference voltage Voref, but also if it does not exceed the constant reference voltage Voref, it may also increase the load on the output transistor and the load.
[0006] Furthermore, the DC-DC converter described above does not take any account of the undershoot of the output voltage Vo at shutdown

Method used

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Embodiment Construction

[0015] figure 1 is a circuit diagram showing the main part structure of a DC-DC converter embodying the present invention. As shown in the figure, the DC-DC converter of this embodiment is a synchronous-correction DC-DC converter, which has a pair of N-channels connected in series between two different potentials (input potential Vi and ground potential GND) MOS (Metal Oxide Semiconductor) field effect transistors N1 and N2 (hereinafter referred to as FET N1 and N2), which function as switching devices, and pass through the LC filter (coil L1 and capacitor C1) produce the desired output voltage Vo.

[0016] The drain of field effect transistor N1 is connected to the power supply voltage line, and the source of field effect transistor N2 is grounded. The source of the field effect transistor N1 and the drain of the field effect transistor N2 are connected together, and the connection node between them is connected to one end of the sensing resistor Rs through the output coil ...

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Abstract

A DC / DC converter produces from an input voltage a desired output voltage by first finding the error voltage between the output voltage and a first reference voltage and then controlling the output current according to the differential voltage between the error voltage and a second reference voltage. Used as the first reference voltage is whichever of a variable reference voltage and a first constant reference voltage is lower, and used as the second reference voltage is whichever of the variable reference voltage and a second constant reference voltage is lower. With this circuit configuration, an overshoot or undershoot in the output voltage can be prevented or reduced.

Description

technical field [0001] The present invention relates to a direct current / direct current (DC-DC) converter for converting an input voltage into a predetermined voltage suitable for output, and more particularly to such a DC-DC converter which firstly obtains an output voltage with a first An error voltage between the reference voltages, a desired output voltage is generated from the input voltage, and an output current is controlled according to a differential voltage between the error voltage and the second reference voltage. Background technique [0002] Some conventional DC-DC converters use soft-start capacitors, such as described in Published Japanese Patent Application Publication No. H7-298614. [0003] This DC-DC converter not only prevents overcurrent, but also prevents inrush current from flowing into the load at startup. [0004] However, in the above-described DC-DC converter, when in order to control the output voltage Vo, the error voltage Vith (the voltage obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M3/07H02M3/158
CPCY02B70/1466H02M3/1588H02M1/32Y10S323/901H02M2001/0025Y02B70/10H02M1/0025H02M3/07
Inventor 梅本清贵竹村兴
Owner ROHM CO LTD