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Full digital soft starting circuit and electric supply system applying the circuit

A soft start circuit, all-digital technology, applied to electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve problems such as phase misalignment

Inactive Publication Date: 2011-05-11
FARADAY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A ring oscillator generates multiple clock signals that are not phase aligned but have the same duty cycle and the same frequency

Method used

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  • Full digital soft starting circuit and electric supply system applying the circuit
  • Full digital soft starting circuit and electric supply system applying the circuit
  • Full digital soft starting circuit and electric supply system applying the circuit

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Embodiment Construction

[0068] In order to make the content of the present invention clearer, the following specific examples are given as examples in which the present invention can actually be implemented.

[0069] In the embodiment of the present invention, in order to improve the disadvantages of the conventional power supply system, which requires an additional external capacitor and the working voltage must be above 1V, an all-digital module is used to achieve the function of the soft-start circuit.

[0070] Please refer to FIG. 2 , which shows a circuit block diagram of a power supply system according to a preferred embodiment of the present invention. The power supply system includes: a voltage conversion module 210 , a selector 220 , a soft-start circuit 230 , a PWM generator 241 and an enabling signal generator 242 .

[0071] When the power supply system starts, the selector 220 will select to conduct the output pulse generated by the soft start circuit 230 to the voltage conversion module ...

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PUM

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Abstract

A full digital soft start circuit is applied in a power source supply system and comprises a ring oscillator, an impulsator, a counter, and a traffic pilot. The ring oscillator generates a clock signal, a phase position of which is not aligned but both a duty ratio and a frequency of which are the same. The impulsator generates a pulse signal, a duty ratio of which is different. The counter generates a multidigit count signal. The traffic pilot decides whether the pulse signal generated by the impulsator is conducted so as to generate an output pulse which is steady over time.

Description

technical field [0001] The present invention relates to a soft-start circuit, and in particular to an all-digital soft-start circuit capable of working under a low-voltage source. Background technique [0002] In a power supply system that requires a pulse width modulation (PWM) signal, due to the buck-boost relationship, it is necessary to use a large inductor or capacitor for energy storage and conversion operations. In order to prevent the components and internal circuits from being damaged by instantaneous high current during the start-up process of the power supply system, a soft-start circuit is currently added to the power supply system. [0003] In the soft-start circuit of the traditional power supply system, a resistor-capacitor circuit is added to the required output voltage. FIG. 1( a ) is a schematic diagram of a soft start circuit of a known technology. As shown in FIG. 1( a ), the known soft-start circuit includes: transistors 101 and 103 , a resistor 102 , ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5375H02M1/08
Inventor 于文浩
Owner FARADAY TECH CORP