Power on / off timing control method and device, and system for NFC transmitting system

CN117728646BActive Publication Date: 2026-10-16BEIJING TSINGTENG MICROSYSTEM CO LTD
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Patent Information

Application Number
CN202311542317.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-17
Publication Date
2026-10-16
Estimated Expiration
2043-11-17

AI Technical Summary

Technical Problem

此外，在升压或降压时，升压型开关变换器中的功率管P型MOS(Metal OxideSemiconductor，金属-氧化物-半导体)衬底在切换电压中(功率管在升压型开关变换器切换工作模式时，切换电压)，如果衬底电压接到了较低点位，衬底会通过较大电流进而影响芯片的使用寿命

Benefits of technology

[0012] In this embodiment, upon power-up, the startup timing of the low-voltage linear regulator is controlled based on the change in the first output voltage of the boost switching converter. Then, based on the magnitudes of the first output voltage and the second output voltage of the low-voltage linear regulator, the operating mode of the boost switching converter is switched, thus sequentially completing the voltage boosting operation of both the boost switching converter and the low-voltage linear regulator. In this way, the voltage boosting operation of the boost switching converter and the low-voltage linear regulator is strictly controlled through timing, thereby preventing the power transistor substrate from generating large currents that could affect the chip's reliability when switching supply voltages.

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Abstract

The application relates to the technical field of near field communication and discloses a power-on and power-off timing control method for an NFC (Near Field Communication) transmitting system, which comprises the following steps: in the case that a power supply circuit is powered on, a boost switching converter is controlled to start, and a first output voltage of the boost switching converter is acquired in real time; in the case that the first output voltage is greater than a first threshold value, a low-voltage linear voltage stabilizer is controlled to start; in the case that the first output voltage is equal to a first initial voltage and a second output voltage is equal to a second initial voltage, the boost switching converter is controlled to switch working modes, so that the first output voltage reaches a first target voltage; the low-voltage linear voltage stabilizer is controlled to boost, so that the second output voltage reaches a second target voltage; and the first threshold value is less than the first initial voltage. The method can avoid the influence of a large current generated by a power tube substrate on the reliability of a chip when the power supply voltage is switched. The application further discloses a power-on and power-off timing control device and system for the NFC transmitting system.
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