A fast-start current generating circuit

By designing a fast-start current generation circuit, the on/off control circuit of the MOS tube is turned on/off, and the current generation in a short time is achieved, which solves the problem of non-linear power consumption and duty cycle in the prior art, reduces power consumption and supports the output of various temperature coefficient currents.

CN117930932BActive Publication Date: 2025-03-21苏州领慧立芯科技有限公司
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Patent Information

Application Number
CN202410085784.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-22
Publication Date
2025-03-21
Estimated Expiration
2044-01-22

AI Technical Summary

Technical Problem

The prior art is difficult to quickly start the current generation circuit in a short time, resulting in non-linear power consumption and duty cycles, affecting the standby time and function richness of the equipment.

Method used

A fast start current generation circuit is designed, which controls the opening/closing of the fast start circuit through the on-off of multiple MOS tubes, and generates a large current instantaneously by dropping the voltage of the node Nb, and quickly starts the current generation circuit, and disconnects the fast start circuit after the current generation circuit is started to achieve rapid shutdown.

Benefits of technology

It realizes starting the current generation circuit in a very short time, reducing the duty cycle of the control signal, reducing the power consumption of the circuit, and supporting the output of positive temperature coefficient current, negative temperature coefficient current and constant temperature coefficient current.

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Abstract

The present invention discloses a fast-start current generating circuit. The circuit comprises: a fast-start circuit, comprising a plurality of MOS tubes, the on / off of the plurality of MOS tubes is controlled by a control signal pdb, thereby controlling the on / off of the fast-start circuit; a current generating circuit, comprising a positive temperature coefficient current module, a negative temperature coefficient current module and a constant temperature coefficient current module. The present invention controls the on / off of the fast-start circuit by a control signal pdb, thereby controlling the on / off of the current generating circuit. When the fast-start circuit is turned on, the node Nb drops from a high level, and a large current is generated instantly, so that the voltage of the node Na is rapidly reduced, thereby realizing a fast-start current generating circuit. After the current generating circuit is started, the fast-start circuit is rapidly closed, thereby shortening the time interval from the on-off of the fast-start circuit, reducing the duty cycle of the control signal pdb, thereby reducing the power consumption of the fast-start circuit.
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