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Soft starting circuit for voltage regulator

A technology of soft-start circuit and voltage regulator, which is applied in the field of power supply, can solve the problems of increasing EMI (ElectroMagneticInterference processing difficulty, reducing chip conversion efficiency, power loss, etc.), to avoid stability problems, low power consumption, and avoid output voltage The effect of the step problem

Inactive Publication Date: 2012-10-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional soft-start circuits in COT control mode such as figure 2 , only control the loop comparator in the start-up phase, so that the reference level of the loop comparator gradually rises with time to prevent excessive inrush current and output voltage overshoot in the inductor current, but due to the On_Timer timer timing T on Therefore, when the chip starts to start, the inductor current will surge, resulting in a step in the output voltage Vo, and the operating frequency of the system changes greatly during the start-up period, such as image 3 As shown, this will lead to unnecessary power loss, reduce the conversion efficiency of the chip, and increase the difficulty of EMI (Electro Magnetic Interference) processing

Method used

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Embodiment Construction

[0013] The principle and working process of the soft start circuit proposed by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 4 The overall block diagram of the voltage regulator using the soft start circuit of the present invention is given, which includes an On_Timer timer module and a loop comparator Loop_Comp module in addition to the soft start circuit Soft_Start module.

[0015] Such as Figure 4 As shown, the Soft_Start module includes a switch device SW1, a capacitor Css, a resistor R1, bias current sources Ibias1 and Ibias2, and an operational amplifier OP, wherein the OP is connected in the form of negative feedback to form a Buffer, and the potential of the output terminal L73 of the OP is clamped to be equal to the potential above the capacitor Css.

[0016] The specific connection relationship is: the switching device SW1 and the capacitor Css are connected between ...

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Abstract

The invention discloses a soft starting circuit for a voltage regulator, and the soft starting circuit comprises a first bias current source, a first capacitance, a switch device, a second bias current source, a first resistance and a first operational amplifier, wherein the second bias current source is arranged between an external power supply and a first terminator of the first resistance, the first terminator of the first resistance is used as an output end of the soft starting circuit, and a second terminator of the first resistance is respectively connected with a negative input end of the first operational amplifier and the output end of the first operational amplifier. The soft starting circuit not only can prevent inductance current surge and overshoot pulse of the output voltage in the starting process, but also can reduce the variation range of the system on-off frequency in the soft starting process and reduce the processing difficulty of the system electromagnetic interference, so that the output voltage is smoothly increased to a stable working value, and the stability problem in the starting process can be avoided.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to the design of a soft start circuit used in a voltage regulator. Background technique [0002] A voltage regulator is a system that completes the conversion of a power supply from one DC form to another, and realizes functions such as output voltage amplitude being greater than or less than input voltage amplitude. There are many control modes for voltage regulators, including voltage mode control, current mode control, constant on-time control (COT (Constant-on-time) control) and so on. The COT control mode is widely used because of its simple control loop structure and fast system response. [0003] In order to prevent the inductor current surge and output voltage overshoot during the power-on process of the chip, a soft-start module is designed when designing the chip, so that the chip transitions smoothly from the startup phase to the stable working state. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/32
Inventor 周泽坤黄建刚谢海武代高强石跃邱实明鑫张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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