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DC power slow start circuit

A technology of slow-start circuit and DC power supply, which is applied in the electronic field, can solve problems such as excessive opening current, difficult control of slow-start current, and excessive selection margin of circuit fuse, so as to achieve accurate control of slow-start current and facilitate selection type effect

Inactive Publication Date: 2006-11-08
深圳市善因科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Referring to Figure 2, using this circuit makes it difficult to control the slow start current
Furthermore, it is not suitable to use a large-capacity load capacitor at the output end of this circuit, otherwise the turn-on current will be too large, so the selection margin of the circuit fuse is too large

Method used

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the present invention is described in further detail:

[0019] Adopt a kind of power supply slow start circuit of the present invention such as image 3 As shown, the circuit includes a MOSFET M1, a switch control circuit 31, a capacitor C1, a diode D1, and two resistors R1 and R2. Wherein, the switch control circuit 31 further includes a capacitor C3 and a resistor R3. Capacitor C3 is connected in parallel between the gate and drain of MOSFET M1, and resistor R3 is connected in series between the gate of MOSFET M1 and the input power supply. The input power supply for this circuit is -48V.

[0020] The switch control circuit can adjust the characteristic of M1 gate-drain junction capacitance Cgd to be linear, so that Vgs has a plateau effect, that is, when the value of Vgs is greater than the threshold voltage Vgs(th), the value of Vgs remains unchanged for a period of time, so t...

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PUM

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Abstract

A DC supply slugging circuit includes a transistor switch and a switch control circuit connected between the grating and the drain of the switch and connected with the input supply, said switch control circuit adjusts the character of the junction capacitance between the grating and the drain of the switch to be expressed as linearity so that the voltage of the source and drain changes in linearity, which can realize that the output slugging voltage changes in fixed tilted ratio and the change is controlled and the instant striking current can be controlled accurately.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a DC power supply slow start circuit. Background technique [0002] At present, with the popularization and popularization of the communication application DPS (Distributed Power System, distributed power supply system), the DC power supply hot-swap slow start control circuit is widely used. Now, the DC power supply slow start circuit is divided into discrete component circuits and circuits using dedicated hot-swappable integrated control chips according to the components used. According to the input voltage of the single board, it is divided into 48V power supply (or other similar voltage) and low voltage ( Such as 5V, 3.3V, etc.), the polarity of the power supply is positive and negative, so the circuit is also different. Its functional purposes mainly include: anti-jitter delay, voltage / current slow start control, etc. [0003] A power supply slow-start circuit using dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/00H03K17/28H03K17/687
Inventor 邓勇威林健明侯加树
Owner 深圳市善因科技有限公司
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