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Error amplifier and direct current voltage conversion circuit and its method

A technology of DC voltage conversion and error amplifier, which is applied in the direction of conversion of DC power input to DC power output, output power conversion devices, instruments, etc., which can solve the problems of lowering product reliability, inability to control the output waveform of error amplifier 11, and operation troubles, etc. problem, to achieve the effect of reducing the jitter phenomenon

Inactive Publication Date: 2007-08-22
AIMTRON TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the existing DC voltage conversion circuit 10 is that the soft start cannot control the output waveform of the error amplifier 11, so the error amplifier 11 will return to the steady state voltage after generating a large instantaneous voltage, forming a jitter state
For many electronic devices, this jitter will cause operational problems and reduce product reliability

Method used

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  • Error amplifier and direct current voltage conversion circuit and its method
  • Error amplifier and direct current voltage conversion circuit and its method
  • Error amplifier and direct current voltage conversion circuit and its method

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Embodiment Construction

[0026] FIG. 3 is an embodiment of the DC voltage conversion circuit of the present invention, wherein the DC voltage conversion circuit 30 includes an error amplifier 31 , a PWM comparator 32 and a driver 33 . The output terminal of the DC voltage conversion circuit 30 is fed to the input terminal via a voltage divider 35 , so the voltage ratio n between the input terminal and the output terminal is between 0 and 1. The biggest difference from the existing DC voltage conversion circuit 10 is that the DC voltage conversion circuit 30 of the present invention sets the function of the soft start 34 in an error amplifier 31 . Due to the addition of the soft start 34 , when the DC voltage conversion circuit 30 starts up, the output voltage of the error amplifier 31 will follow the slowly rising soft start voltage. And when the soft-start voltage exceeds the steady-state value V of the output voltage of the error amplifier 31 err Afterwards, the soft start 34 loses control over the...

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Abstract

An error amplifier, DC voltage converter, and their application method are disclosed. Said DC voltage converter can provide a soft starting function to the error amplifier. When the DC voltage converter is started, the output voltage of error amplifier will follow the slowly raising soft start voltage. When the soft start voltage is higher than the steady-state output voltage of error amplifier, the control of soft start voltage to error amplifier is lost and the error amplifier is controlled by input, so eliminating the dither of output voltage.

Description

technical field [0001] The present invention relates to an error amplifier and DC voltage conversion circuit (DC-DC converter) and its method, in particular to an error amplifier and DC voltage conversion circuit using soft start (soft start) to reduce voltage jitter (jitter) and its method. Background technique [0002] DC voltage conversion circuits have been widely used in the development and design of electronic products. For portable products, when the battery is in a discharge state, its output voltage value also drops accordingly. At this time, a DC voltage conversion circuit is required inside the portable product to fix the output voltage at a certain value. In addition, many different operating voltages are usually required in general electronic equipment, and this function also needs to be completed by a DC voltage conversion circuit. [0003] The existing DC voltage conversion circuit 10 , as shown in FIG. 1 , includes an error amplifier 11 , a PWM comparator ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00H02M1/08H02M3/00H02M1/36
Inventor 曾光男陈天赐陈勇志
Owner AIMTRON TECH CORP