Time-delay power supply circuit, power supply time delay method and boost system

Abstract

The embodiment of the invention provides a time-delay power supply circuit, a power supply time delay method and a boost system and relates to the field of electronics. By the embodiment of the invention, a boost chip without an enabling pin can be in a working state after a boost period of input power voltage is finished, and a boost effect of the boost chip is ensured. The time-delay power supply circuit comprises a control unit and a time-delay power supply unit, wherein the control unit comprises a first control port, and is connected with the time-delay power supply unit through the first control port and used for controlling the switch-on and switch-off of the time-delay power supply unit; the time-delay power supply unit comprises a second control port, an output port and a power input port; the second control port is connected with the first control port; the power input port is connected with a power supply; and the output port is connected with the input end of the boost chip and used for outputting the stabilized voltage of the power supply to the boost chip after the boost period of the power voltage is finished and a switch-on signal of the control unit is received. The embodiment of the invention is applicable to power supply of the boost chip.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a delay power supply circuit, a power supply delay method and a voltage boosting system. Background technique [0002] A general boost chip has two pins, Vin power input and EN enable. In actual use, some classic boost chips only have a Vin pin, without a separate EN pin. From a functional point of view, after the Vin pin reaches the recognition level of the chip, the boost chip starts to work, that is, the two pins are combined into one. [0003] In actual use, the input voltage of the Vin pin of the boost chip does not reach the required voltage immediately, but needs a certain ramp-up time, and the input voltage of the boost chip does not actually reach the required voltage during this period of time. required voltage. In the traditional boost circuit, if the boost chip starts to work during the boost ramp period, it will cause the switch MOS tube in the peripheral circuit connec...

AI Technical Summary

Problems solved by technology

In the traditional boost circuit, if the boost chip starts to work during the boost ramp period, it will cause the switch MOS tube in the peripheral circuit connected to the 6th pin (drive pin) of the boost chip to be turned on to the ground. , so that the input voltage will be pulled down, failing to achieve the purpose of boosting

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