CN105651443A - Pressure alarm output circuit - Google Patents

Abstract

The invention provides a pressed alarm output circuit, which is characterized in that: the circuit comprises resistors R1 and R2 and an operational amplifier A1, wherein the resistors R1 and R2 are connected between the Vset2 end of the power supply and the ground end in series, and the resistor R2 is a piezoresistor; the positive phase input end of the operational amplifier A1 is connected with the resistor R2 to obtain the voltage thereof, the negative phase input end is connected with an external preset voltage Vset1, and the output end is connected with the alarm signal output end Vout of the circuit. The invention has the beneficial effects that: the circuit has the advantages of simple structure and small volume, is directly distributed on each part of a chip circuit, finds the pressed condition in time and gives an alarm, prospectively avoids the trouble of loss and maintenance, is a product with excellent performance no matter seen from the economical efficiency or the practicability, and is suitable for popularization and use.

Description

Pressure alarm output circuit

technical field

The invention relates to a pressure alarm output circuit.

Background technique

When the chip circuit is pressed or bent by external force, it will cause irreparable damage to the chip circuit. Generally speaking, there are few cases where the chip circuit is directly touched or pressed, and it is more likely that the circuit board is deformed due to the inaccurate installation position. It is difficult to find the problem in a short period of time. Only when the circuit components have been It can only be known after being damaged by pressure. At this time, engineers not only have a headache how to detect and repair the circuit, but the most important thing is that the equipment cannot work, causing direct economic losses. If we can find the problem when the board is deformed and the components are not damaged, it will save a lot of trouble.

Contents of the invention

In view of the problems mentioned in the background technology, the present invention proposes a pressure alarm output circuit, which has a simple circuit structure and a small size, and is directly arranged in each part of the chip circuit to detect the pressure situation in time and give an alarm. The technical solution is as follows:

A pressure alarm output circuit, including resistors R1, R2, and operational amplifier A1, the resistors R1 and R2 are connected in series between the power supply Vset2 terminal and the ground terminal, wherein the resistor R2 is a piezoresistor; the The positive input terminal of the operational amplifier A1 is connected to the resistor R2 to obtain its voltage, the negative input terminal is connected to an external preset voltage Vset1, and the output terminal is connected to the alarm signal output terminal Vout of the circuit.

The beneficial effects of the present invention are: the circuit structure is simple, the volume is small and exquisite, it is directly arranged in each part of the chip circuit, the pressure situation is detected in time and an alarm is given, and the trouble of loss and maintenance is avoided prospectively. No matter from the perspective of economy or practicability, All are products with excellent performance, suitable for promotion and use.

Description of drawings

FIG. 1 is a schematic structural diagram of the pressure alarm output circuit of the present invention.

detailed description

The scheme of this application is further described in conjunction with the accompanying drawings as follows:

A pressure alarm output circuit, including resistors R1, R2, and operational amplifier A1, the resistors R1 and R2 are connected in series between the power supply Vset2 terminal and the ground terminal, wherein the resistor R2 is a piezoresistor; the The positive input terminal of the operational amplifier A1 is connected to the resistor R2 to obtain its voltage, the negative input terminal is connected to an external preset voltage Vset1, and the output terminal is connected to the alarm signal output terminal Vout of the circuit.

The above-mentioned preferred implementation mode should be regarded as an illustration of the implementation mode of the scheme of this application, and any technical deduction, replacement, improvement, etc. that are similar to, similar to, or based on the scheme of this application should be regarded as the scope of protection of this patent.

Claims (1)

1. a pressurized alarm output circuit, it is characterised in that: including resistance R1, R2 and operational amplifier A 1, described resistance R1 and R2 is connected in series between power supply Vset2 end and ground end, and wherein, described resistance R2 is varistor; The normal phase input end of described operational amplifier A 1 connects resistance R2 to obtain its voltage, and the predeterminated voltage Vset1 outside negative-phase input connection, outfan is connected to the alarm signal output ends Vout of circuit.