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Undervoltage protection circuit

An under-voltage protection and circuit technology, which is applied in the field of high-speed and high-precision under-voltage protection circuits, can solve the problems that the accuracy is difficult to be guaranteed, and the speed of judging the power supply voltage VDD is limited, so as to achieve the effect of both accuracy, jitter prevention, and fast response

Inactive Publication Date: 2020-09-18
SUZHOU NOVOSENSE MICROELECTRONICS
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, to compare voltages in the prior art, it is necessary to establish the reference voltage Vref first, which depends on the establishment accuracy and establishment speed of the reference voltage Vref
The general reference voltage Vref is the output of the bandgap reference, and it usually takes 10-100us to set up time, so it will limit the judgment speed of the power supply voltage VDD
If a simple reference voltage is established in order to increase speed, the accuracy is difficult to be guaranteed

Method used

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Embodiment Construction

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0026] like Figure 1 to Figure 2 An undervoltage protection circuit is provided as shown, and the undervoltage protection circuit includes a power supply voltage VDD, a threshold module 1 connected to the power supply voltage VDD, and a switch module 2 connected to the threshold module 1; the threshold module 1 outputs Threshold volta...

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Abstract

The invention provides an undervoltage protection circuit. The undervoltage protection circuit comprises a power supply voltage, a threshold module connected with the power supply voltage and a switchmodule connected with the threshold module, wherein the threshold module outputs a threshold voltage, the switch module receives the threshold voltage and outputs a switch signal, the switch signal comprises an opening signal and a closing signal, and the threshold module receives the switch signal to adjust the threshold voltage; when the power supply voltage is greater than the threshold voltage, the switch module outputs a closing signal, and the threshold voltage is reduced; when the power supply voltage is smaller than the threshold voltage, the switch module outputs an opening signal, and the threshold voltage rises. Therefore, the power supply voltage can directly generate the threshold voltage through the threshold module, so that a reference voltage establishing circuit does notneed to be additionally arranged, and quick response can be realized. Moreover, an additional comparator circuit is not needed, so that the circuit is simplified, the function of the circuit can be realized, and the precision requirement is met.

Description

technical field [0001] The invention relates to the field of analog circuits, in particular to a high-speed and high-precision undervoltage protection circuit. Background technique [0002] The undervoltage protection circuit in the prior art needs to use the divided voltage value of the power supply voltage VDD to compare with the reference voltage Vref, and directly set the comparator to output the comparison result, and control the start and stop of the subsequent circuit. Therefore, when the divided voltage value of the power supply voltage VDD is greater than the reference voltage Vref, the subsequent stage circuit is activated; and when the divided voltage value of the power supply voltage VDD is smaller than the reference voltage Vref, the subsequent stage circuit is turned off, thereby realizing undervoltage protection. Moreover, the comparison result can be used to adjust the divided voltage value of the power supply voltage VDD, so as to realize the hysteresis of t...

Claims

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Application Information

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IPC IPC(8): H02H3/24
CPCH02H3/24
Inventor 龚晓寒盛云
Owner SUZHOU NOVOSENSE MICROELECTRONICS