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Soft starting device capable of implementing linear control

A soft-start, soft-start circuit technology, applied in output power conversion devices, control/regulation systems, instruments, etc., can solve problems affecting the normal operation of other circuits, load capacitance or load damage, etc., to save chip area and power. consumption, avoid the effect of inrush current

Inactive Publication Date: 2008-10-29
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The circuit sometimes causes damage to the load capacitance or load when it is started. At the same time, for a power supply with limited drive capability, the voltage is pulled very low when it is started, which will affect the normal operation of other circuits.

Method used

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  • Soft starting device capable of implementing linear control
  • Soft starting device capable of implementing linear control
  • Soft starting device capable of implementing linear control

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Embodiment Construction

[0037] The soft start device that can realize linear control provided by the present invention adopts a linear control method to implement soft start control for switching power supply converters, and can effectively control the load capacitance of the power supply by controlling the value of the soft start capacitor and the charging current of the soft start capacitor the charging current.

[0038] In the first embodiment, as figure 2 As shown, the soft-start circuit using a constant current source is applied to the soft-start device of the Buck circuit, compared with figure 1 , the device includes, in addition to figure 1 In addition to the original working circuit shown, it also includes a voltage generator, the first comparator COMPS, the first selector MUX1, and the second selector MUX2; in the figure EA is the second error amplifier in the original working circuit, which consists of multiple cascaded Composed of error amplifiers, wherein the first-stage error amplifie...

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PUM

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Abstract

The invention discloses a soft start device that can realize linear control, which comprises a working circuit, a soft start circuit and a start control circuit; the working circuit comprises a DC power source, a load capacitance, a power tube and a feedback circuit which are connected between the DC power source and the load capacitance and also a soft start circuit and a start control circuit, and the power tube is provided with a control end; the soft start circuit comprises a voltage generator, the output voltage of which is increased gradually after start, and an error amplifier, the input end of which is connected with the output end of the voltage generator; the input end of the error amplifier is connected between the output end of the power tube and the ground, while the output end of the error amplifier is connected to the control end of the power tube; when the start control circuit detects that the start begins, the soft start circuit is set to be in normal working state and a feedback circuit is set to be in off working state. The adoption of the device of the invention can avoid surge current at the moment when the power source charges the load capacitance at the instance when the circuit is electrified, can repeatedly use the existing error amplifier in the original circuit structure and save the areas and energy consumption of chips.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a soft start device. Background technique [0002] like figure 1 As shown, the Step-Down step-down converter (Buck) circuit mainly includes: power supply V BAT , main power tube Q2, synchronous rectification switch Q1 (Q1 can also be replaced by rectifier diode or Schottky diode), inductor L, and load R LOAD and load capacitance C OUT . Among them, the feedback loop includes: connected to the output terminal V OUT and ground V SS between the two voltage divider resistors R F1 and R F2 , Error amplifier EA, comparator COMP and drive circuit (Drive Circuit). Through the voltage divider resistor R F1 and R F2 Sample the output voltage to get V FB , V FB with reference voltage V REF Input to the two input terminals of the error amplifier respectively, and its output signal V EAO After slope compensation (Slope Comp), it is input to the inverting input terminal of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/156
Inventor 郑儒富
Owner VIMICRO CORP
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