Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Regulator circuit capable of detecting variations in voltage

A regulator circuit and detection circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as slow response speed and difficulty in suppressing output voltage changes

Inactive Publication Date: 2006-03-01
ROHM CO LTD
View PDF1 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the current flowing through the load decreases suddenly, the response speed becomes slow, so the output current may fluctuate.
In addition, it is difficult to suppress fluctuations in the output voltage due to fluctuations in the input voltage

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Regulator circuit capable of detecting variations in voltage
  • Regulator circuit capable of detecting variations in voltage
  • Regulator circuit capable of detecting variations in voltage

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0044] FIG. 1 shows the configuration of a regulator circuit 100 according to the first embodiment. In the following figures, the same components are given the same reference numerals, and explanations thereof are appropriately omitted.

[0045] The regulator circuit 100 of this embodiment includes a detection circuit 20 and an auxiliary circuit 30 in addition to the error amplifier 10 , the output transistor 12 , the first resistor R1 , the second resistor R2 , and the reference voltage source 14 . In addition, the regulator circuit 100 includes an input terminal 102 and an output terminal 104 , and the voltages applied or presented to the respective terminals are respectively referred to as an input voltage Vin and an output voltage Vout.

[0046] The error amplifier 10, the output transistor 12, the first resistor R1 and the second resistor R2 constitute a general linear regulator.

[0047] The output transistor 12 is provided between the input terminal 102 and the output ...

no. 2 approach

[0070] In the first embodiment, overshooting is suppressed by feeding back the circuit variation detected by the detection circuit 20 to the gate terminal of the output transistor 12 . In the second embodiment to be described below, by feeding back the voltage variation detected by the detection circuit 20 to the error amplifier 10 constituting the regulator circuit 100, the gain of the error amplifier 10 is increased to speed up the response speed, so that only when the circuit is in a transient state Improve the responsiveness of the regulator circuit.

[0071] Figure 4 The structure of the regulator circuit 100 of the second embodiment is shown. The regulator circuit 100 includes an error amplifier 10 , an output transistor 12 , a reference voltage source 14 , a first resistor R1 , a second resistor R2 , a detection circuit 20 , and an auxiliary circuit 40 .

[0072] The detection circuit 20 is connected to the input terminal 102 and detects fluctuations in the input vol...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

To suppress a variation in output voltage upon occurrence of a variation in input voltage or output current without any increase in steady-state power consumption, in a regulator circuit. A regulator circuit 100 includes a detection circuit 20 and an auxiliary circuit 30 in addition to an error amplifier 10, an output transistor 12, a first resistor R1, a second resistor R2, and a reference voltage source 14. The error amplifier 10, the output transistor 12, the first resistor R1, and the second resistor R2 form a typical linear regulator. The detection circuit 20 includes a detecting capacitor C1, a first transistor M1, and a gain control resistor R3, which are serially connected between an input terminal 102 and a ground terminal. A variation in input voltage leads to a change in potential at one end of the detecting capacitor C1 in accordance with an input voltage Vin, and a transient detecting current Idec transiently flows to allow detection of a voltage variation. The detecting current Idet is amplified in the auxiliary circuit 30, and a feedback current Ifd is fed back to a gate terminal of the output transistor 12.

Description

technical field [0001] The present invention relates to a regulator circuit that stabilizes an input voltage and outputs it. Background technique [0002] In order to operate an electronic circuit stably, it is sometimes necessary to stabilize its power supply voltage to a certain value. In addition, the power supply voltage required by each electronic circuit is not necessarily arranged in the device on which the electronic circuit is mounted. For example, a 5V microcomputer of an in-vehicle device requires 5V as a power supply voltage, but the voltage supplied by a car battery is 12V, which is unstable. In such a situation, in order to easily and stably generate a power supply voltage required by an electronic circuit, a regulator circuit is widely used. [0003] Typically, such a regulator circuit includes an error amplifier with an output transistor and a feedback resistor. The error amplifier compares the output voltage fed back by the feedback resistor with a requir...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56H03G3/12
Inventor 西村一彦猪上浩树西川信广
Owner ROHM CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com