CN219496516U

CN219496516U - Simplified overvoltage detection circuit

Info

Publication number: CN219496516U
Application number: CN202320798995.5U
Authority: CN
Inventors: 王献伟; 徐东桂; 陶天龙
Original assignee: Guangzhou Weide Electric Equipment Co ltd
Current assignee: Guangzhou Weide Electric Equipment Co ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-08-08
Anticipated expiration: 2033-04-11

Abstract

The utility model belongs to the technical field of circuit detection, and particularly relates to a simplified overvoltage detection circuit. The positive input end of the singlechip is connected with a third variable resistor and a fourth variable resistor in series, and a sixteen resistor and a eleven capacitor are connected in parallel between the fourth variable resistor and the positive input end of the singlechip; the negative input end of the singlechip is connected with a first variable resistor and a second variable resistor in series; the positive and negative input ends of the singlechip are respectively connected with a first anti-reverse diode group and a second anti-reverse diode group, the positive power supply end of the singlechip is respectively connected with the positive electrode of the analog voltage and the fifth capacitor, and the other end of the fifth capacitor is connected with the negative electrode of the analog power supply; the output end of the singlechip is connected with a resistor seventeen in series, and the other end of the resistor seventeen and a negative power supply analog grounding end of the singlechip are connected with a capacitor twenty and a capacitor twenty in parallel; and twenty-two resistors are connected in parallel between the negative input end and the output end of the singlechip. The method simplifies the original complex circuit, reduces the cost and improves the precision; has higher anti-interference capability.

Description

Simplified overvoltage detection circuit

Technical Field

The utility model belongs to the technical field of circuit detection, and particularly relates to a simplified overvoltage detection circuit.

Background

Voltage refers to the work done by the force of an electric field to move a unit positive charge from one point to another in the electric field, called voltage. Voltage measurement is an important aspect of electronic circuit measurement. Is the basis for many electrical parameter measurements. Currently, the method used is to add an independent op-amp by digital isolation op-amp. The original circuit is complex, the cost is higher, the precision is lower, and the PCB layout and wiring difficulty is increased.

Disclosure of Invention

To solve the defects and the shortages of the prior art; the utility model aims to provide a simplified overvoltage detection circuit which has the advantages of simple structure, reasonable design and convenient use, simplifies the original circuit, reduces the cost and improves the precision; has higher anti-interference capability.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the circuit comprises a singlechip, a first variable resistor, a fourth variable resistor, a sixteenth resistor, a seventeenth resistor, a twenty-second resistor, a fifth capacitor, a eleventh capacitor, a twenty-second capacitor, a first anti-reverse diode group and a second anti-reverse diode group; the positive input end of the singlechip is connected with a third variable resistor and a fourth variable resistor in series, and a sixteen resistor and a eleven capacitor are connected in parallel between the fourth variable resistor and the positive input end of the singlechip; the negative input end of the singlechip is connected with a first variable resistor and a second variable resistor in series; the positive and negative input ends of the singlechip are respectively connected with a first anti-reverse diode group and a second anti-reverse diode group, the positive power supply end of the singlechip is respectively connected with the positive electrode of the analog voltage and the fifth capacitor, and the other end of the fifth capacitor is connected with the negative electrode of the analog power supply; the output end of the singlechip is connected with a resistor seventeen in series, and the other end of the resistor seventeen and a negative power supply analog grounding end of the singlechip are connected with a capacitor twenty and a capacitor twenty in parallel; and twenty-two resistors are connected in parallel between the negative input end and the output end of the singlechip.

Preferably, the first anti-reverse connection diode group and the second anti-reverse connection diode group are connected by two groups of diodes, the two groups of diodes are connected in series between the anode and the cathode of the analog power supply, are conducted from the cathode to the anode, and are pulled out from between the two diodes to be connected into the singlechip.

Preferably, the singlechip adopts an MCP6001 operational amplifier chip.

Preferably, the input ends of the third and fourth variable resistors are connected with a direct-current voltage signal.

Preferably, the variable resistors one to four keep the same specification, and are freely adjusted according to different input voltages.

After the structure is adopted, the utility model has the beneficial effects that: the method simplifies the original complex circuit, reduces the cost and improves the precision; has higher anti-interference capability.

Drawings

For a clearer description of embodiments of the present utility model or technical solutions in the prior art, the present utility model is described in detail by the following detailed description and the accompanying drawings.

FIG. 1 is a schematic diagram of the structure of the present utility model;

reference numerals illustrate: the single chip microcomputer U3, variable resistors one to four RK1-RK4, sixteen resistors R16, seventeen resistors R17, twenty-two resistors R22, five capacitors C5, eleven capacitors C11, twenty-two resistors twenty-20-C22, one anti-reverse diode group D6, two anti-reverse diode groups D7, a positive analog power supply voltage AVCC and a negative analog power supply voltage AGND.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

It should be noted here that, in order to avoid obscuring the present utility model due to unnecessary details, only structures and/or processing steps closely related to the solution according to the present utility model are shown in the drawings, while other details not greatly related to the present utility model are omitted.

Referring to fig. 1, the following technical scheme is adopted in this specific embodiment: the anti-reverse diode set D6 and the anti-reverse diode set D7 are connected through a single chip microcomputer U3, a variable resistor I to a variable resistor IV RK1-RK4, a resistor sixteen R16, a resistor seventeen R17, a resistor twenty-two R22, a capacitor five C5, a capacitor eleven C11, a capacitor twenty-two to a resistor twenty-two C20-C22; the positive input end of the singlechip U3 is connected in series with a variable resistor three RK3 and a variable resistor four RK4, and a resistor sixteen R16 and a capacitor eleven C11 are connected in parallel between the variable resistor four RK4 and the positive input end of the singlechip U3; the negative input end of the singlechip U3 is connected in series with a variable resistor one RK1 and a variable resistor two RK2; the positive and negative input ends of the singlechip U3 are respectively connected with a first anti-reverse diode group D6 and a second anti-reverse diode group D7, the positive power supply end of the singlechip U3 is respectively connected with an analog voltage positive pole AVCC and a capacitor five C5, and the other end of the capacitor five C5 is connected with an analog power supply negative pole AGND; the output end of the singlechip U3 is connected with a seventeen resistor R17 in series, and the other end of the seventeen resistor R17 and the negative power analog ground end of the singlechip U3 are connected with a capacitor twenty C20 and a capacitor twenty-one C21 in parallel; and a resistor twenty-two R22 and a resistor twenty-two C22 are connected in parallel between the negative input end and the output end of the singlechip U3.

The anti-reverse connection diode group I D6 and the anti-reverse connection diode group II D7 are connected by two groups of diodes, the two groups of diodes are connected in series between the anode and the cathode of the analog power supply, are conducted from the cathode to the anode, and are pulled out from between the two diodes to be connected into the singlechip U3; the singlechip U3 adopts an MCP6001 operational amplifier chip; the input ends of the variable resistor three RK3 and the variable resistor four RK4 are connected with direct-current voltage signals; the variable resistors one to four RK1-RK4 keep the same specification, and are freely adjusted according to different input voltages.

The working principle of the specific embodiment is as follows: the circuit of the utility model divides the input voltage through four precise voltage dividing resistors, then sends the divided voltage into an operational amplifier through an RC circuit and two clamping circuits, and then sends the collected voltage signal to an MCU unit for measurement by utilizing a negative feedback system of the operational amplifier.

The reference formula is as follows:

the utility model simplifies the original circuit complexity, reduces the cost and improves the precision; has higher anti-interference capability.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. An simplified overvoltage detection circuit, characterized by: the circuit comprises a singlechip, a first variable resistor, a fourth variable resistor, a sixteenth resistor, a seventeenth resistor, a twenty-second resistor, a fifth capacitor, a eleventh capacitor, a twenty-second capacitor, a first anti-reverse diode group and a second anti-reverse diode group; the positive input end of the singlechip is connected with a third variable resistor and a fourth variable resistor in series, and a sixteen resistor and a eleven capacitor are connected in parallel between the fourth variable resistor and the positive input end of the singlechip; the negative input end of the singlechip is connected with a first variable resistor and a second variable resistor in series; the positive and negative input ends of the singlechip are respectively connected with a first anti-reverse diode group and a second anti-reverse diode group, the positive power supply end of the singlechip is respectively connected with the positive electrode of the analog voltage and the fifth capacitor, and the other end of the fifth capacitor is connected with the negative electrode of the analog power supply; the output end of the singlechip is connected with a resistor seventeen in series, and the other end of the resistor seventeen and a negative power supply analog grounding end of the singlechip are connected with a capacitor twenty and a capacitor twenty in parallel; and twenty-two resistors are connected in parallel between the negative input end and the output end of the singlechip.

2. An simplified overvoltage detection circuit according to claim 1, wherein: the first anti-reverse connection diode group and the second anti-reverse connection diode group are connected by two groups of diodes, the two groups of diodes are connected in series between the anode and the cathode of the analog power supply, are conducted from the cathode to the anode, and are pulled out from between the two diodes to be connected into the singlechip.

3. An simplified overvoltage detection circuit according to claim 1, wherein: the singlechip adopts an MCP6001 operational amplifier chip.

4. An simplified overvoltage detection circuit according to claim 1, wherein: and the input ends of the third variable resistor and the fourth variable resistor are connected with a direct-current voltage signal.

5. An simplified overvoltage detection circuit according to claim 1, wherein: the variable resistors I to IV keep the same specification, and are freely adjusted according to different input voltages.