CN214539784U

CN214539784U - Voltage detection circuit based on FM33G048

Info

Publication number: CN214539784U
Application number: CN202023275210.1U
Authority: CN
Inventors: 王�琦; 赵涛
Original assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Current assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-10-29
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a voltage detection circuit based on FM33G048, including singlechip, DC power supply, first resistance, second resistance and electric capacity. The positive pole of the direct current power supply is connected with one pin of the first resistor, the negative pole is grounded, the two pins of the first resistor are connected with one end of the capacitor, the other end of the capacitor is connected with one pin of the second resistor, and the two pins of the second resistor are grounded; the 66 th pin of the singlechip is connected with the two pins of the first resistor, and the 68 th pin of the singlechip is connected with the pin of the second resistor. The utility model discloses a mode that electric capacity charge-discharge comes measuring voltage, only needs to add an electric capacity, and the design is more simple. The invention has simple circuit design, saves the area of the PCB, is beneficial to the miniaturization of equipment and reduces the cost of raw materials.

Description

Voltage detection circuit based on FM33G048

Technical Field

The utility model belongs to the technical field of instrument intelligent control, a voltage detection circuit is related to.

Background

With the rapid development of power electronic technology and the use of a large number of integrated control circuits, it is important to detect each electrical parameter in the system quickly, accurately and safely. The detection and protection circuit of the main circuit voltage is one of the keys influencing the reliable and stable operation of the system.

The existing voltage detection circuit mainly uses an optical coupler or a photoelectric relay as a control switch to detect voltage, and the circuit is complex. And this time utility model mainly comes measuring voltage through the mode of electric capacity charge-discharge, only needs to add an electric capacity, and the design is more simple.

Disclosure of Invention

To the not enough that exists among the prior art, the utility model provides a voltage detection circuit based on FM33G 048.

A voltage detection circuit based on FM33G048 comprises a single chip microcomputer U9, a direct-current power supply P1, a first resistor R10, a second resistor R12 and a capacitor C9.

The positive pole of the direct current power supply P1 is connected with one pin of a first resistor R10, the negative pole is grounded, two pins of a first resistor R10 are connected with one end of a capacitor C9, the other end of the capacitor C9 is connected with one pin of a second resistor R12, and two pins of a second resistor R12 are grounded; the 66 th pin of the singlechip U9 is connected with the two pins of the first resistor R10, and the 68 th pin of the singlechip U9 is connected with the pin of the second resistor R12.

Furthermore, the single chip microcomputer U9 adopts a chip with the model number of FM33G 048.

The utility model discloses beneficial effect as follows:

the utility model discloses a mode that electric capacity charge-discharge comes measuring voltage, only needs to add an electric capacity, and the design is more simple. The utility model discloses circuit design is simple, has saved the miniaturization that the PCB area is favorable to equipment, has reduced raw and other materials cost.

Drawings

FIG. 1 is a circuit diagram of a voltage detection portion according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a part of the single chip microcomputer according to the embodiment of the present invention.

Detailed Description

In order to explain technical contents, structural features, and achieved effects of the present invention in detail, the following detailed description is made with reference to the accompanying drawings in combination with the embodiments.

As shown in fig. 1 and 2, the voltage detection circuit based on FM33G048 includes a single chip microcomputer U9, a dc power supply P1, a first resistor R10, a second resistor R12, and a capacitor C9.

The single chip microcomputer U9 adopts a chip with the model number of FM33G 048.

The working process is as follows:

the voltage is detected by charging and discharging the capacitor. The power supply P1 provides a 6V power supply, and the first resistor R10 and the second resistor R12 are used for voltage division in the circuit, and the power supply voltage is indirectly detected by detecting the voltage across the C9. The single chip microcomputer firstly lowers the ADC _ CTL port and the Vin _ ADC port to ensure that the capacitor C9 is discharged completely. The single chip microcomputer puts the ADC _ CTL open drain pin high, the capacitor C9 starts to charge, and the single chip microcomputer detects the voltage at two ends of the R12 through the Vin _ ADC port. The ADC _ CTL open drain pin goes high 100US and goes low, discharging capacitor C9 to remain low. The time span from the first time of the ADC _ CTL open drain pin to the second time of the ADC _ CTL open drain pin is set to be 3S, namely, the voltage is detected by the Vin _ ADC port every three seconds. The above process is repeated to continuously detect whether the power supply condition of the power supply voltage is normal, and the problem of power supply faults of the circuit can be immediately checked.

Claims

1. A voltage detection circuit based on FM33G048 is characterized by comprising a single chip microcomputer U9, a direct-current power supply P1, a first resistor R10, a second resistor R12 and a capacitor C9;

2. The FM33G 048-based voltage detection circuit as claimed in claim 1, wherein said single chip microcomputer U9 is a FM33G048 chip.