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Current Sampling Device

A current sampling and current technology, applied in the direction of logic circuit connection/interface layout, adjustment of electrical variables, data acquisition and recording, etc., can solve the problem of increasing the power consumption of the resistance sampling circuit chip, increasing the on-resistance of the USB switch, increasing the chip area, etc. problems, to achieve the effect of saving chip area, low on-resistance, and improving integration

Active Publication Date: 2012-02-15
SUZHOU CBC MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] There are some problems in the scheme of the current sampling circuit using the sampling resistor: the on-resistance of the USB switch is increased due to the series connection of the sampling resistor and the power tube; moreover, the current flowing through the power tube 201 is 1:1 The current sampling makes the sampling current the same as the output current, which increases the power consumption of the resistance sampling circuit and the chip; in addition, due to the use of low resistance sampling resistance, the area of ​​the chip is increased; in addition, in terms of process implementation, the resistance accuracy is limited offset also limits the accuracy of sampling current

Method used

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Embodiment Construction

[0040] An embodiment of the present invention provides a current sampling device for sampling a power unit in a USB switch, the power unit includes an input terminal, an output terminal and a control terminal, wherein the current sampling device includes: a sampling unit, An operational amplifier and a regulating unit; the input terminal of the sampling unit is connected to the input terminal of the power unit as the first input terminal of the current sampling device; the control terminal of the sampling unit is used as the first input terminal of the current sampling device The second input end is connected to the control end of the power unit; the output end of the sampling unit is connected to the first input end of the adjustment unit and the first input end of the operational amplifier; the operation The second input end of the amplifier is connected to the output end of the power unit; the second input end of the adjustment unit is connected to the output end of the oper...

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Abstract

A current sampling device for sampling a power unit of a USB switch, the current sampling device comprising: a sampling unit, an operational amplifier and an adjustment unit, the input end of the sampling unit serves as the first input end of the current sampling device, and is connected with the the input terminal of the power unit is connected; the control terminal of the sampling unit is used as the second input terminal of the current sampling device, and is connected to the control terminal of the power unit; the output terminal of the sampling unit is connected to the first input of the adjustment unit connected to the first input end of the operational amplifier; the second input end of the operational amplifier is connected to the output end of the power unit; the second input end of the adjustment unit is connected to the output end of the operational amplifier; The output end of the adjustment unit serves as the output end of the current sampling device. The present invention samples the power unit current in proportion, occupies small chip area, has low power consumption, low on-resistance and high sampling precision.

Description

technical field [0001] The invention relates to a current sampling technology, in particular to a current sampling device in a universal serial bus (USB). Background technique [0002] With the widespread use of electronic products, the way of data transmission using USB has been rapidly developed. refer to figure 1 , the USB device may include a USB control unit 101 , a USB switch 102 and a USB port 103 . During the USB data transmission process, the USB control unit 101 generates a control signal according to the indication signal (FLAG) fed back by the USB switch 102, and inputs the control signal to the USB switch 102, and supplies power to the USB port 103 through the USB switch 102; The USB port performs data transmission under the control of the USB control unit 101 . Wherein, the power unit is usually used for output in the USB switch, the input terminal of the power unit is connected to the input terminal (IN) of the USB switch, the output terminal of the power u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0175G05F3/28G06F17/40
Inventor 于立明郭亮林武源
Owner SUZHOU CBC MICROELECTRONICS