An undervoltage protection circuit
An undervoltage protection and circuit technology, applied in the field of integrated circuit protection, can solve problems such as misoperation of undervoltage protection circuits
Inactive Publication Date: 2011-12-28
SUZHOU SHIHAO BUILDING MATERIAL NEW TECH ENG
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[0010] But at this time VDD is still in the undervoltage state, that is to say, the undervoltage protection circuit has malfunctioned
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[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027] image 3 It is a functional block diagram of the first embodiment of the undervoltage protection circuit of the present invention; an undervoltage protection circuit, including: a voltage sampling module 100, used to obtain the sampling voltage of the power supply;
[0028] The reference voltage generation module 103 is used to generate the secondary power supply VDD2 and the reference voltage VREF. The reference voltage generation module includes a third voltage regulator tube D3, which generates a stable The secondary power supply voltage VDD2 and the reference...
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The invention discloses an undervoltage protection circuit which comprises a voltage sampling module, a reference voltage generation module, a first undervoltage control module, a second undervoltage control module and a logical processing module, wherein the voltage sampling module is used for acquiring the sampling voltage of a power supply; the reference voltage generation module is used for generating a secondary power supply and a reference voltage; when the power supply voltage is higher than the voltage stabilizing value of a third voltage stabilizing tube, the second undervoltage control module outputs second non-undervoltage signals, and when the power supply voltage is lower than the voltage stabilizing value of the third voltage stabilizing tube, the second undervoltage control module outputs second undervoltage signals of high level; and when any signal of output signals of the first undervoltage control module and the output signals of the second undervoltage control module is an undervoltage signal, the logical processing module outputs the undervoltage signal. The undervoltage protection circuit provided by the invention comprises the second undervoltage control module and the logical processing module, thus when the power supply is lower than the voltage stabilizing value of the third voltage stabilizing tube, the second undervoltage signals are output, and the undervoltage signals are output directly through the logical processing module, thus the problem of error signal output only for the first undervoltage control module is solved.
Description
technical field [0001] The invention relates to the technical field of integrated circuit protection, in particular to an undervoltage protection circuit. Background technique [0002] When the integrated circuit chip is working, the stability of the voltage is particularly important. Although a chip with a rated voltage of 15V will not be burned if it works at 8V or even 5V, the long-term low-voltage operation will cause excessive power consumption of the chip and cause adverse effects on it, and the circuit stability will also become very serious. Poor, so need to use the undervoltage protection circuit to avoid circuit work in this case. [0003] Such as figure 1 It is a schematic diagram of an undervoltage protection circuit in the prior art; figure 2 is the schematic diagram of the reference voltage generation module circuit; figure 2 Among them, D3 and D4 are regulator tubes, and the voltage regulator value is 5V; when the power supply VDD is powered on and the v...
Claims
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IPC IPC(8): H02H3/24
Inventor 闫宪斗
Owner SUZHOU SHIHAO BUILDING MATERIAL NEW TECH ENG