Voltage comparator circuit

Abstract

The invention relates to a voltage comparator circuit which comprises a voltage input terminal, a first resistor, a second resistor, a first transistor, a second transistor and a voltage output terminal, wherein, the voltage input terminal is grounded after passing through the first resistor and the second resistor in sequence, nodes between the first resistor and the second resistor are connected with the base electrode of the first transistor, the emitter of the first transistor is grounded, the collector of the first transistor is connected with a DC power supply and the base electrode of the second transistor, the emitter of the second transistor is connected with the DC power supply, and the collector of the second transistor is connected with the voltage output terminal. The voltage comparator circuit can realize the basic function of the comparator, and has simple design and comparatively low cost.

Description

technical field [0001] The invention relates to a voltage comparator circuit. Background technique [0002] At present, voltage comparators are often used in the design of various electronic products, such as LM339 voltage comparator chips. The basic principle of the voltage comparator is: connect an input voltage, that is, the voltage to be compared, to the non-inverting input terminal of the voltage comparator, and connect a reference voltage (threshold level) to the inverting input terminal of the voltage comparator. When the input voltage is greater than the reference voltage, the output of the voltage comparator is high level, and when the input voltage is lower than the reference voltage, the output of the voltage comparator is low level. [0003] Although the voltage comparators sold on the market are fully functional, the price is too high. For circuits of electronic products that are not very demanding, such a fully functional voltage comparator is not needed, and ...

AI Technical Summary

Problems solved by technology

[0003] Although the voltage comparators sold on the market are fully functional, the price is too high. For circuits of electronic products that are not very demanding, such a fully functional voltage comparator is not needed, and the high price will also cause Increased cost of electronics

In addition, since voltage comparators are all IC (integrated circuit) process components, manufacturers must also bear the risk of IC shortages. If the production line is stopped due to the shortage of voltage comparators, the indirect loss is often very high.

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