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Current source starting circuit

A technology for starting circuits and current sources, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problem of consuming static power consumption, achieve the effects of reducing static current consumption, novel design, and strong practicability

Inactive Publication Date: 2020-05-12
XTX TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the main body of the current source circuit is in a normal working state, the pull-down of the first MOS transistor mn3 causes the third MOS transistor mn4 to be turned off, but since the first MOS transistor mn3 mirrors the operating current of the main body of the current source circuit, the current source circuit starts The circuit needs to consume a certain amount of static power

Method used

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Embodiment Construction

[0016] The technical problem to be solved by the present invention is: in the start-up process of the existing current source, it is necessary to use a mirror tube to mirror the working current of the main body of the current source circuit, so that the start-up circuit of the current source circuit needs to consume a certain amount of static power consumption. The technical idea proposed by the present invention with respect to this technical problem is: construct a current source starting circuit, use a switch tube circuit to start the current source circuit, and use a current detection circuit to detect the current value of the current source circuit and use it as the current value of the current source circuit When the preset current threshold is reached, the switch tube circuit is turned off, thus reducing the static current consumption of the current source start-up circuit.

[0017] In order to make the technical purpose, technical solution and technical effect of the pr...

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Abstract

The invention provides a current source starting circuit. The current source starting circuit comprises a switching tube circuit (30) and a current detection circuit (10); the switching tube circuit (30) is electrically connected with a current source circuit (20) and is used for starting the current source circuit (20); and the current detection circuit (10) is electrically connected with the current source circuit (20) and the switching tube circuit (30) and is used for detecting the current value of the current source circuit (20) and switching off the switching tube circuit (30) when the current value of the current source circuit (20) reaches a preset current threshold value. The current source starting circuit is novel in design and high in practicability.

Description

technical field [0001] The invention relates to the technical field of power starting, in particular to a current source starting circuit. Background technique [0002] Independent current source circuits are widely used inside analog ICs to provide bias current for analog circuits. There are two merger points in the current source circuit, one is the working current under normal working conditions, and the other is zero current, so there is a problem of starting, and a separate starting circuit is needed to help it start. [0003] Such as figure 1 as shown, figure 1 A circuit diagram of an existing current source circuit starting circuit is shown. The starting circuit of the current source circuit uses the operating current of the main body of the current source circuit mirrored by the first MOS transistor mn3, and then uses the current detection circuit composed of the first MOS transistor mn3 and the second MOS transistor mp1 to control the opening of the third MOS tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 鲍奇兵
Owner XTX TECH INC
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