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Soft start and direct-current voltage conversion circuit and electronic device

A soft-start circuit and conversion circuit technology, applied in the field of circuits, can solve the problem of low reliability of the soft-start circuit and achieve the effect of high reliability

Inactive Publication Date: 2015-06-17
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can solve the problem of low reliability of the soft start circuit in the prior art

Method used

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  • Soft start and direct-current voltage conversion circuit and electronic device
  • Soft start and direct-current voltage conversion circuit and electronic device

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Embodiment Construction

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] see figure 1 , is a circuit diagram of a soft-start circuit according to an embodiment of the present invention. In this embodiment, the soft-start circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, the first diode D1, the second diode D2 and the operational amplifier U1,

[0029] The connection relationship of the above components is: one end of the fi...

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Abstract

The invention discloses a soft start circuit. One end of a first resistor is connected with the positive pole of a direct-current power supply, the other end of the first resistor is connected with a positive input end of an operational amplifier, one end of a second resistor is grounded, the other end of the second resistor is connected with the positive input end of an operational amplifier, one end of a third resistor is connected with the direct-current power supply, the other end of the third resistor is connected with a negative input end of the operational amplifier, the negative pole of a first diode is connected with the positive pole of the direct-current power supply, the positive pole of the first diode is connected with the negative input end of the operational amplifier, a first capacitor is connected between the negative input end and the output end of the operational amplifier in a bridging mode, the negative input end of the operational amplifier is grounded through a second capacitor, the positive pole of a second diode is connected with the output end of the operational amplifier, and the negative pole of the second diode is connected with an enabling pin of a buck converter chip. The invention further discloses a direct-current voltage conversion circuit and an electronic device. By means of the soft start circuit, the direct-current voltage conversion circuit and the electronic device, reliability is high, and deadlock and spurious triggering are avoided.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a soft-start circuit, a DC voltage conversion circuit and electronic equipment. Background technique [0002] At present, Buck buck converters are generally used in switching power supplies in electronic equipment in various industries. Among the integrated chips of buck converters, some use external pins to set the soft-start time, and some internally fix the soft-start time, saving energy. Gone external pins to reduce cost. [0003] In some practical applications, it is found that chips with external soft-start pins sometimes fail to discharge the charge in time due to the internal soft-start capacitor, or a large capacitor is connected to the output end of the power supply, which causes the overcurrent protection circuit to act and lock up when the system restarts. , the power supply cannot work normally; those chips with fixed soft-start time sometimes cannot meet the requirements of...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M3/04
CPCH02M1/36H02M3/04
Inventor 周明杰张飞
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD
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