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Stabilized DC power supply device

A DC power supply, stable technology, applied in the output power conversion device, DC power input conversion to DC power output, electrical components and other directions, can solve problems such as impossible measurement

Inactive Publication Date: 2006-10-04
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not possible to measure for such image 3 Indicates the temperature near the output transistor of a conventional regulated DC power supply device, since the output transistor is externally connected to the

Method used

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  • Stabilized DC power supply device
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  • Stabilized DC power supply device

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Embodiment Construction

[0023] Hereinafter, embodiments of the present invention are described with reference to the drawings. figure 1 It is a circuit diagram showing a configuration example of a stable DC power supply device realizing the present invention. exist image 3 The same parts that also appear in are marked with the same symbols, and repeated descriptions will not be repeated.

[0024] exist figure 1 Indicates that the stabilized DC power supply device for implementing the present invention is configured in such a way that it can be supplied to the image 3 The conventional stabilized DC power supply device shown is newly provided with an operational amplifier 9 and a multiplication circuit 10 . exist figure 1 The shown stabilized DC power supply device is configured in such a manner that operational amplifier 4, operational amplifier 6, operational amplifier 7, constant current source 8, operational amplifier 9, and multiplying circuit 10 are contained in a single semiconductor inte...

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Abstract

According to the conventional stabilized DC power supply device, there is a possibility that the output transistor breaks down by heat when the input voltage fluctuates. To cope with this, the stabilized DC power supply device embodying the invention is so configured as to comprise an output transistor for converting an input voltage to an output voltage and feeding out the output voltage, a control circuit for controlling the output transistor so as to maintain a value of the output voltage constant, a current detection circuit for detecting an output current of the output transistor, a voltage detection circuit for detecting a voltage appearing between an input side and an output side of the output transistor, a multiplying circuit for multiplying an output of the current detection circuit and an output of the voltage detection circuit together, and a protection circuit for restricting a wattage power of the output transistor according to an output of the multiplying circuit.

Description

technical field [0001] The present invention relates to a stable DC (direct current) power supply unit. In particular, the present invention relates to a stabilized DC power supply device having an output transistor that converts an input voltage to an output voltage and delivers the output voltage. Background technique [0002] Among conventional stabilized DC power supply devices, there is a stabilized DC power supply device that uses an externally connected output transistor so that its properties can be changed in order to handle a small current output as well as a large current output. [0003] image 3 is a circuit diagram showing a configuration example of a conventional stable DC power supply device having an output transistor connected externally. The positive terminal of the DC power supply 2 is connected to the drain of an externally connected n-channel MOSFET 1 (Metal Oxide Semiconductor Field Effect Transistor) as an output transistor, and the negative terminal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158G05F1/10G05F1/56G05F1/569H02M3/155
CPCG05F1/569H02M3/155
Inventor 大久保卓也竹村兴
Owner ROHM CO LTD