CN-224233657-U - Circuit for controlling voltage scaling of operational amplifier by using relay

CN224233657UCN 224233657 UCN224233657 UCN 224233657UCN-224233657-U

Abstract

The utility model relates to the field of circuit design, in particular to a circuit for controlling the voltage scaling of an operational amplifier by using a relay. According to the utility model, the OP07CP operational amplifier utilizes the low offset voltage characteristic of the OP07CP operational amplifier to enable offset voltage drift voltage to be very small, errors caused by offset voltage are avoided, the small signals can be amplified and processed more accurately in a high-precision, low-noise and high-common-mode rejection ratio wide power voltage range, and the voltage scaling ratio of the circuit can be dynamically adjusted.

Inventors

ZHOU XIAOLING
PAN JIAWEI
SUN XINYI
LI SHUYAN
Rong Ruiyang
HUANG CHAOXIAN
HUANG KEXIN
CHEN WENZHI
WU LISHUANG
CHEN YILIN
HUANG SIHAN
CHEN QINGSEN

Assignees

泉州师范学院

Dates

Publication Date: 20260512
Application Date: 20250529

Claims (7)

1. A circuit for controlling the voltage scaling of an operational amplifier using a relay, comprising: the singlechip is used for sending an instruction; the relay is electrically connected with the singlechip and is used for receiving instructions of the singlechip; The control circuit is connected with the relay and used for outputting high voltage and low voltage input ends; The operational amplification module is connected with the control circuit and is used for receiving the high-voltage and low-voltage signals output by the control circuit, amplifying the high-voltage and low-voltage input signals and feeding the processed signals back to the singlechip; The operational amplifier module includes: At least three OP07CP operational amplifiers, the three operational amplifiers are OP07CP operational amplifiers A1, OP07CP operational amplifier A2 and OP07CP operational amplifier A3, the non-inverting input ends of the OP07CP operational amplifiers A1 and OP07CP operational amplifier A2 are respectively connected with the positive end and the negative end of the input signal, the OP07CP operational amplifier A3 receives the output signals of the OP07CP operational amplifiers A1 and OP07CP operational amplifier A2 through a resistor network and performs final amplification output; the relay feedback resistor module comprises resistors with different resistances connected in parallel, and each resistor is connected into a feedback loop through a relay contact connected with the resistor in series; The relay is used for switching different feedback resistors to dynamically adjust the voltage scaling of the circuit, allowing the circuit to adapt to a variety of input signal ranges.
2. The circuit for controlling the voltage scaling of the operational amplifier by using the relay according to claim 1, wherein the OP07CP operational amplifier and the relay are powered by independent 12V storage batteries, the positive power end of the operational amplifier is connected with the positive power end of the power supply after being connected with the control circuit, the negative power line of the power supply is connected with the grounding end of the system on one hand, the electrical safety is ensured, and on the other hand, a current loop is provided for signal transmission and power supply among the relay, the operational amplifier and the singlechip and is connected to the grounding pin of the singlechip, so that a complete signal and power transmission link is formed.
3. A circuit for controlling the scaling of an operational amplifier voltage by a relay according to claim 2, wherein the battery is provided with a voltage regulator between the OP07CP operational amplifier and the relay.
4. The circuit for controlling the voltage scaling of the operational amplifier by using the relay according to claim 2, wherein the power supply of the relay can be cut off through the singlechip in a non-working state, so that the circuit enters a sleep mode, and the power consumption is reduced.
5. A circuit for controlling the scaling of an operational amplifier voltage by a relay according to claim 1, wherein the inverting input of the OP07CP operational amplifier A1 is connected to the output thereof by a resistor R1 and the inverting input of the OP07CP operational amplifier A2 is connected to the output thereof by a resistor R3.
6. A circuit for controlling the scaling of an operational amplifier voltage by a relay according to claim 5, wherein said resistor R1 and said resistor R3 are connected by a resistor R2.
7. The circuit for controlling the voltage scaling of the operational amplifier by using the relay according to claim 1, wherein the output end of the OP07CP operational amplifier A2 is connected with the non-inverting input end of the OP07CP operational amplifier A3 by a resistor R5, the non-inverting input end of the OP07CP operational amplifier A3 is also connected with an adjustable resistor R7 connected with the resistor R5 in parallel, and the other end of the adjustable resistor R7 is grounded.

Description

Circuit for controlling voltage scaling of operational amplifier by using relay Technical Field The utility model relates to the field of circuit design, in particular to a circuit for controlling the voltage scaling of an operational amplifier by using a relay. Background In many fields such as industrial production, environmental monitoring and intelligent house, accurate collection and processing of voltage data are vital. Along with the rapid development of solar cell technology, perovskite batteries are gradually emerging as novel photovoltaic cells, the test range of the conventional perovskite battery tester is relatively narrow, the conventional voltage acquisition equipment can only process a limited voltage range, cannot adapt to the wide-range output voltage of novel photovoltaic cells such as perovskite batteries and the like, the test result is incomplete, the acquisition equipment can induce voltage changes and generate corresponding electric signals, however, a plurality of limitations exist in practical application, and the conventional voltage acquisition equipment is easy to receive external electromagnetic interference in the signal transmission process, so that fluctuation and errors of acquired voltage data are easy to occur. In the face of scenes requiring accurate voltage data as decision basis, such as high-precision industrial production flow control, scientific research experiments with strict requirements on voltage stability and the like, the voltage acquisition precision and stability in the prior art are far insufficient, and the acquisition result has larger deviation from an actual voltage signal, so that the further development and application of the related fields are greatly limited. Disclosure of Invention Accordingly, in order to solve the above-mentioned drawbacks, the present utility model provides a circuit for controlling the voltage scaling of an operational amplifier by using a relay, so as to solve the above-mentioned technical problems. In order to achieve the purpose, the circuit for controlling the voltage scaling of the operational amplifier by using the relay comprises a singlechip, the relay, a control circuit and an operational amplification module, wherein the relay is electrically connected with the singlechip, the control circuit is connected with the relay, the operational amplifier is connected with the control circuit and is used for receiving high-voltage and low-voltage signals output by the control circuit, amplifying the high-voltage and low-voltage input signals and feeding the processed signals back to the singlechip; The operational amplifier module comprises at least three OP07CP operational amplifiers and a relay feedback resistor module, wherein the three operational amplifiers are respectively an OP07CP operational amplifier A1, an OP07CP operational amplifier A2 and an OP07CP operational amplifier A3, the non-inverting input ends of the OP07CP operational amplifiers A1 and the OP07CP operational amplifier A2 are respectively connected with the positive end and the negative end of an input signal, the OP07CP operational amplifier A3 receives the output signals of the OP07CP operational amplifier A1 and the OP07CP operational amplifier A2 through a resistor network and performs final amplification output, the relay feedback resistor module comprises resistors with a plurality of different resistances which are connected in parallel, and each resistor is connected into a feedback loop through a relay contact connected with the resistor in series; The relay is used for switching different feedback resistors to dynamically adjust the voltage scaling of the circuit, allowing the circuit to adapt to a variety of input signal ranges. Preferably, the OP07CP operational amplifier and the relay are powered by independent 12V storage batteries, the positive power end of the operational amplifier is connected with the positive power end of the power supply after being connected with the control circuit, the negative power line of the power supply is connected with the grounding end of the system on one hand, the electrical safety is ensured, and on the other hand, a current loop is also provided for signal transmission and power supply among the relay, the operational amplifier and the singlechip, and the current loop is connected to the grounding pin of the singlechip to form a complete signal and power supply transmission link. Preferably, the storage battery is provided with a voltage stabilizing tube between the OP07CP operational amplifier and the relay. Preferably, the circuit can cut off the power supply of the relay through the singlechip under the non-working state, so that the circuit enters a sleep mode, and the power consumption is reduced. Preferably, the inverting input terminal of the OP07CP operational amplifier A1 is connected to the output terminal thereof through a resistor R1, and the inverting input terminal of the OP07CP operation