Breakover time generation circuit for BULK converter

A technology of conduction time and circuit generation, which is applied in the electronic field, can solve problems affecting the frequency accuracy of BULK converters, and achieve the effect of eliminating the impact

Inactive Publication Date: 2015-07-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the resistor will change with the temperature, so the temperature drift of the resistor will undoubtedly affect the final frequency accuracy of the BULK converter

Method used

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  • Breakover time generation circuit for BULK converter
  • Breakover time generation circuit for BULK converter
  • Breakover time generation circuit for BULK converter

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Embodiment Construction

[0013] The present invention is described in detail below in conjunction with accompanying drawing

[0014] The invention proposes a turn-on time generation circuit for a BULK converter that can eliminate the variation of the temperature coefficient of resistance so as to stabilize the switching frequency, and can well realize that the turn-on time is inversely proportional to the input voltage.

[0015] Such as figure 1 As shown, the circuit of the present invention includes a voltage division module, a voltage clamp module, a current generation and charging module, and a timer module; the input terminal of the voltage division module is connected to an external input voltage, and its output terminal is connected to the input of the voltage clamp module terminal; the output terminal of the voltage clamping module is connected to the input terminal of the current generator and the charging module; the output terminal of the current generated in the charging module is connected...

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Abstract

The invention belongs to the field of electronic technologies, and particularly relates to a breakover time generation circuit for a BULK converter. The breakover time generation circuit comprises a voltage division module, a voltage clamp module, a current generation and charging module and a timer module. The input end of the voltage division module is connected with external input voltage, and the output end of the voltage division module is connected with the input end of the voltage clamp module. The output end of the voltage clamp module is connected with the input end of the current generation and charging module. The output end of the current generation and charging module is connected with the input end of the timer module. The breakover time generation circuit has the advantages that the influence on the breakover time of on-chip resistor temperature coefficients can be eliminated, the breakover time of the converter is only determined through plug-in large resistance and power voltage, the influence brought by the temperature is avoided, the influence on the breakover time of the on-chip resistor temperature coefficients can be eliminated, the breakover time of the converter is only determined through the plug-in large resistance and power voltage, and the influence brought by the temperature is avoided. The breakover time generation circuit is especially suitable for the BULK converter.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to an on-time generating circuit for a BULK converter in an adaptive on-time (Adaptive Constant On-Time, ACOT) control mode. Background technique [0002] The constant on-time (Constant On-Time, COT) control mode is widely used in BULK converters because it has the advantage of relatively fast transient response. However, due to the constant conduction time generated by the timer, the switching frequency is greatly affected by the input voltage. The ACOT control mode BULK converter timer circuit produces a conduction time that is inversely proportional to the input voltage, making the switching frequency independent of the input voltage and making the frequency more stable. [0003] In order to realize the function that the timer time is inversely proportional to the input voltage of the traditional ACOT control mode BULK converter, it usually needs to generate a current propor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M1/08
CPCH02M1/08H02M3/155
Inventor 明鑫付奎艾鑫李天生芮松鹏王卓周泽坤张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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