Alarm and protection circuit and method for direct-current/alternating-current power source

Abstract

The invention relates to an alarm and protection circuit and method for a direct-current / alternating-current power source. A programmable parallel voltage-stabilizing diode, an optical isolation transistor, a voltage comparator and a potentiometer are adopted to construct the alarm and protection circuit for the direct-current / alternating-current power source. A function realized by the circuit isto adjust a power source to be tested, it is required that a working voltage should be controlled to be between alternating-current 160V to 220V, and when voltage input is lower than 160V, a power source alarm is given out; when the output of the power source to be tested is tested, it is required that the working voltage should be controlled to be between direct-current 4.5V to 5V, when voltageoutput is lower than 4.5V, a power source alarm is given out; after the power source is cut off, discharge time lasts about 100mS; alarm signals are outputted by the alarm and protection circuit and received by a CPU; and user data are stored through using the discharge time. With the alarm and protection circuit and method for the direct-current / alternating-current power source of the invention adopted, input voltage values and output voltage values can be can accurately monitored in real time, whether a power source module works normally can be the checked, and user data loss caused by voltage loss can be effectively avoided. The alarm and protection circuit and method of the present invention can be used at the output end of the direct-current / alternating-current power source and can effectively protect user data.

Description

technical field [0001] The invention relates to the field of hardware protection circuits, in particular to a DC and AC power supply alarm protection circuit and method. Background technique [0002] Traditional power alarm protection circuits are mainly divided into power alarm protection circuits with UPS (uninterruptible power supply) and power alarm protection circuits without UPS. Because the UPS is expensive, the power alarm protection circuit with UPS is generally used in high-precision fields such as aerospace, national defense and hospitals, and currently does not have general applicability. The power supply alarm protection circuit without UPS is more widely used, including enterprise products, personal computers, etc., but there are disadvantages such as complicated circuit, non-adjustable, and low precision. Contents of the invention [0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present inventi...

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Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a DC and AC power supply alarm protection circuit, the purpose of which is to solve the shortcomings of the traditional power supply alarm protection circuit, such as expensive, complicated circuit and poor flexibility.

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