Current control circuit
A current control circuit and current control technology, which is applied in the direction of control/regulation system, adjustment of electric variables, instruments, etc., can solve problems such as damaged components, system function errors, and external circuit overload
Inactive Publication Date: 2012-05-16
SAMSUNG SEMICON CHINA RES & DEV +1
View PDF5 Cites 24 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At this time, the power transistor 15 is fully turned on (that is, the power transistor 15 operates in the deep linear region), so the inrush current flowing through the power transistor 15 can be the rated output current of the low dropout voltage regulator circuit 10 (that is, the rated output current of the external circuit Load current) 3 times or more, causing the supply circuit of the first power supply Vin and / or the external circuit to be overloaded, thereby damaging components in these circuits, and may also cause system malfunction
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0028]Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the exemplary embodiments to those skilled in the art. In the drawings, the size and relative sizes of layers and regions are exaggerated for clarity. In the drawings, the same reference numerals denote the same elements throughout.
[0029] figure 2 is a block diagram illustrating a current control circuit 100 according to an exemplary embodiment.
[0030] refer to figure 2 , the current control circuit 100 may include a first power transistor MOS1 , a second power transistor MOS2 , and a controller 110 . The first power transistor MOS1 and the second power transistor MOS2 may be connected in paralle...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a current control circuit which comprises a first power transistor, a second power transistor and a controller, wherein the first power transistor and the second power transistor are connected between a first power source and the output end of the current control circuit, and the width-to-length ratio of the first power transistor is smaller than that of the second power transistor; the controller responds to a received enabling signal, so that the first power transistor and the second power transistor are conducted in sequence; when receiving the enabling signal, the controller conducts the first power transistor, so that power supplied from the first power source is supplied to the output end through the first power transistor; and when the voltage level of the output end is equal to the level of a preset output voltage of the current control circuit, the controller conducts the second power transistor, so that power supplied from the first power source is supplied to the output end through the second power transistor which operates in a saturation region. Therefore, the current control circuit can perform the function of soft startup, and restricts inrush current.
Description
technical field [0001] The present invention relates to the field of electronic circuits, more specifically, to a current control circuit capable of limiting inrush current. Background technique [0002] Currently, low dropout (LDO) regulators have been widely used in power supply circuits to reduce the input-output voltage difference. LDOs can also prevent overloading of loads by limiting current. [0003] figure 1 is a circuit diagram showing a conventional low dropout regulator circuit 10. [0004] refer to figure 1 , the traditional low dropout regulator circuit 10 includes an error amplifier 11 , a feedback resistor network 12 , a reference voltage source 13 , a driving buffer 14 , and a power transistor 15 . [0005] like figure 1 As shown in , the power transistor 15 is connected between the input power supply (the first power supply) Vin and the output terminal OUT of the low dropout regulator circuit 10 . The error amplifier 11 includes a positive input termin...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/468G05F1/575G05F1/59
Inventor 朱海刚
Owner SAMSUNG SEMICON CHINA RES & DEV