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Linear soft startup circuit with controllable time

A soft-start circuit and linear technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of low circuit reliability, complex design, high cost, etc., and achieve the effect of simple and reliable structure and accurate judgment

Pending Publication Date: 2017-03-15
江阴元灵芯旷微电子技术有限公司
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AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned prior art, the purpose of the present invention is to provide a time-controllable linear soft-start circuit. In the prior art, there is a strong surge effect caused by a voltage step change through the digital segment start, and when the input power exists When noise occurs, this effect will further lead to the sudden on and off of the output power supply before the soft start time is reached, so that the overall circuit has technical problems such as low reliability and low stability; at the same time, the soft start time setting circuit of the prior art is complex , using a large number of timers and oscillators, there are technical problems such as high cost and complex design

Method used

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  • Linear soft startup circuit with controllable time
  • Linear soft startup circuit with controllable time
  • Linear soft startup circuit with controllable time

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Embodiment 1

[0054] The operational amplifier switch output circuit includes an operational amplifier, a power switch and a voltage dividing resistor; the noninverting input terminal of the operational amplifier is connected to the potential point B, the inverting input terminal is connected to the middle potential point of the voltage dividing resistor, and the output terminal of the operational amplifier is connected to the power The grid of the switch and the power supply VCC are connected to the voltage dividing resistor through the power switch, and the highest potential point of the voltage dividing resistor is used as the output terminal of the power adjustment circuit. All field effect transistors in the current mirror circuit can preferably be P-channel field effect transistors. The construction of the first reference potential point can be connected to the load through the power supply VCC. The load can be a resistor, a triode connected to the resistor or a field effect tube, and ...

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Abstract

The invention discloses a linear soft startup circuit with controllable time, relates to the technical field of power supply startup circuits and aims at solving the technical problems that a strong surge effect is caused by a voltage step change in digital segmented startup, a soft startup time setting circuit is complicated, and a lot of timers and oscillators are utilized to cause high cost and a complicated design in the prior art. The linear soft startup circuit mainly comprises a power supply regulating circuit, a logic judgment circuit, a linear energy storage device and a charging circuit. The linear soft startup circuit is used for soft startup circuit design of a switching power supply.

Description

technical field [0001] The invention relates to the technical field of power starting circuits, in particular to a time-controllable linear soft starting circuit. Background technique [0002] The existing technology adopts the method of digital segmental adjustment, the soft start voltage rises stepwise, and the output voltage also rises stepwise, while the present invention adopts the linear soft start method, the start voltage and the output voltage of the power supply voltage adjustment circuit are also linear rise, thus achieving a linear soft-start process. Contents of the invention [0003] In view of the above-mentioned prior art, the purpose of the present invention is to provide a time-controllable linear soft-start circuit. In the prior art, there is a strong surge effect caused by a voltage step change through the digital segment start, and when the input power exists When noise occurs, this effect will further lead to the sudden on and off of the output power...

Claims

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Application Information

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IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 俞德军骆军陈远文
Owner 江阴元灵芯旷微电子技术有限公司
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