CN116885669A - MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit - Google Patents
MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit Download PDFInfo
- Publication number
- CN116885669A CN116885669A CN202311153142.7A CN202311153142A CN116885669A CN 116885669 A CN116885669 A CN 116885669A CN 202311153142 A CN202311153142 A CN 202311153142A CN 116885669 A CN116885669 A CN 116885669A
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- resistor
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- voltage
- capacitor
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- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
An input voltage overvoltage and undervoltage protection circuit controlled by an MCU, comprising; the main control unit U2, the VCC end of the main control unit U2 receives a first voltage, the first voltage is also connected with the thermistor RT1, one end of the thermistor RT1 is grounded through an electrolytic capacitor C6 and a resistor R3 respectively, and the common connection end of the electrolytic capacitor C6 and the resistor R3 is also connected with the VSS end of the main control unit U2; the power supply circuit further comprises a second voltage from a switching power supply main control board, the second voltage is grounded through a resistor R1 and a resistor R2, the resistor R1 is further connected with a capacitor C5 through a resistor R5, one end of the capacitor C5 is connected with the VIN end of the main control unit U2, the other end of the capacitor C5 is connected with the VSS end, and the other end of the capacitor C5 is connected with the STB end through the resistor R5; the input end of the main control unit U2 is grounded through a resistor R6 and a resistor R7, one end of the resistor R6 is also connected with the grid electrode of the MOS tube Q1, the source electrode is grounded, and the drain electrode receives the STB signal of the main control unit U2.
Description
Technical Field
The application relates to the field of chip protection, in particular to an overvoltage and undervoltage protection circuit for controlling input voltage by an MCU.
Background
The traditional switch power supply overvoltage, undervoltage and overtemperature protection mainly depends on a main control chip, has obvious defects, and the chip can be damaged when reaching the limit parameter, and the chip is often damaged due to the lack of control and follow-up means for the limit voltage in the prior art.
Disclosure of Invention
In order to solve the problems, the technical scheme provides an overvoltage and undervoltage protection circuit for controlling input voltage by an MCU, which consists of the MCU and a peripheral circuit, and the working mode of a switching power supply is changed to achieve the effect of protecting devices before reaching limit parameters so as to prevent the devices from being permanently damaged.
In order to achieve the above purpose, the technical scheme is as follows:
an input voltage overvoltage and undervoltage protection circuit controlled by an MCU, comprising;
the main control unit U2, wherein the VCC end of the main control unit U2 receives a first voltage, the first voltage is also connected with the thermistor RT1, one end of the thermistor RT1 is grounded through an electrolytic capacitor C6 and a resistor R3, and the common connection end of the electrolytic capacitor C6 and the resistor R3 is also connected with the VSS end of the main control unit U2;
the power supply circuit further comprises a second voltage from a switching power supply main control board, the second voltage is grounded through a resistor R1 and a resistor R2, the resistor R1 is further connected with a capacitor C5 through a connection, one end of the capacitor C5 is connected with the VIN end of the main control unit U2, the other end of the capacitor C5 is connected with the VSS end, and the other end of the capacitor C5 is connected with the STB end through the resistor R5;
the input end of the main control unit U2 is grounded through a resistor R6 and a resistor R7, one end of the resistor R6 is also connected with the grid electrode of the MOS tube Q1, the source electrode is grounded, and the drain electrode receives the STB signal of the main control unit U2.
In some embodiments, the master control unit U2 is of the type TX8C1010SO8C.
In some embodiments, the VIN end of the main control unit U2 is an input point of the input voltage on the main control board of the switching power supply after being divided by the bridge rectifier resistor.
The application has the beneficial effects that:
the application forms a protective control circuit for overvoltage, undervoltage and overtemperature of the input voltage of the switching power supply by the MCU and the peripheral circuit, and has good protective effect on the main control device of the switching power supply, so as to prevent the device from being permanently damaged due to overhigh input voltage and overhigh environment, and is suitable for power supplies such as a switching power supply, an adapter, an LED display screen power supply, an LED centralized power supply driving power supply and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below.
Fig. 1 is a schematic structural view of an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the application more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Referring to FIG. 1, an MCU-controlled input voltage over-voltage and under-voltage protection circuit includes;
the main control unit U2, wherein the VCC end of the main control unit U2 receives a first voltage (+ 5V), the first voltage (+ 5V) is also connected with the thermistor RT1, one end of the thermistor RT1 is grounded through an electrolytic capacitor C6 and a resistor R3, and the common connection end of the electrolytic capacitor C6 and the resistor R3 is also connected with the VSS end of the main control unit U2;
the power supply circuit further comprises a second voltage (VCC-H) from a switching power supply main control board, wherein the second voltage (VCC-H) is grounded through a resistor R1 and a resistor R2, the resistor R1 is further connected with a capacitor C5, one end of the capacitor C5 is connected with the VIN end of the main control unit U2, the other end of the capacitor C5 is connected with the VSS end, and the other end of the capacitor C5 is connected with the STB end through the resistor R5;
the input end of the main control unit U2 is grounded through a resistor R6 and a resistor R7, one end of the resistor R6 is also connected with the grid electrode of the MOS tube Q1, the source electrode is grounded, and the drain electrode receives the STB signal of the main control unit U2.
Specifically, the model of the main control unit U2 is TX8C1010SO8C.
Specifically, the VIN end of the main control unit U2 is an input point of the input voltage on the main control board of the switching power supply after voltage division by the bridge rectifier resistor.
The main control unit U2 is a singlechip, a 7 th pin (VIN) of the singlechip is an input point of the switch power supply main control board after the input voltage is divided by a bridge rectifier resistor, when the input voltage is detected to be higher than the upper limit of the rated voltage, a pin 6 of the singlechip outputs a low level so as to enable a pin 3 of the singlechip to be grounded, thus a pin 8 is suspended, the +5V is enabled to be grounded and discharged through an electrolytic capacitor, the VCC voltage of the main control chip on the large board can be pulled down to stop working and the electrolytic capacitor is discharged to the ground, the device is protected from being damaged, and the input voltage is recovered to be normal when the input voltage is reduced to the upper limit of the rated voltage range by 90%; the 6 th pin pwmin of the singlechip is a waveform capturing pin of a MOS drain electrode of a constant-current chip of the switching power supply, and the load change is detected;
when VIN detects that the AC input voltage is lower than the lower limit voltage, AM outputs PWM signal with duty ratio of 1KHz of 50%, and the PWM signal can be connected to PWM dimming pin of dimming chip to output under-voltage half-power. The input voltage is recovered to be normal when rising to the lower limit of the rated voltage;
the temperature protection principle, singlechip 4 th foot is connected with thermistor RT1, and this pin converts ambient temperature's change into voltage value to detect current temperature state, when temperature reached rated upper limit value, STB output low level, switching power supply main control chip stopped work, got into the overtemperature protect function, and ambient temperature falls to rated upper limit, STB output high level, gets into default function.
The foregoing description of the preferred embodiments of the present application is not intended to limit the scope of the application, but rather is presented in the claims.
Claims (3)
1. An input voltage overvoltage and undervoltage protection circuit controlled by an MCU is characterized by comprising;
the main control unit U2, wherein the VCC end of the main control unit U2 receives a first voltage, the first voltage is also connected with the thermistor RT1, one end of the thermistor RT1 is grounded through an electrolytic capacitor C6 and a resistor R3, and the common connection end of the electrolytic capacitor C6 and the resistor R3 is also connected with the VSS end of the main control unit U2;
the power supply circuit further comprises a second voltage from a switching power supply main control board, the second voltage is grounded through a resistor R1 and a resistor R2, the resistor R1 is further connected with a capacitor C5 through a connection, one end of the capacitor C5 is connected with the VIN end of the main control unit U2, the other end of the capacitor C5 is connected with the VSS end, and the other end of the capacitor C5 is connected with the STB end through the resistor R5;
the input end of the main control unit U2 is grounded through a resistor R6 and a resistor R7, one end of the resistor R6 is also connected with the grid electrode of the MOS tube Q1, the source electrode is grounded, and the drain electrode receives the STB signal of the main control unit U2.
2. The circuit for controlling input voltage over-voltage and under-voltage protection by MCU according to claim 1, wherein: the model of the main control unit U2 is TX8C1010SO8C.
3. The circuit for controlling input voltage over-voltage and under-voltage protection by MCU according to claim 1, wherein: the VIN end of the main control unit U2 is an input point of the switching power supply main control board after the input voltage is divided by the bridge rectifier resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311153142.7A CN116885669B (en) | 2023-09-08 | 2023-09-08 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311153142.7A CN116885669B (en) | 2023-09-08 | 2023-09-08 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116885669A true CN116885669A (en) | 2023-10-13 |
| CN116885669B CN116885669B (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311153142.7A Active CN116885669B (en) | 2023-09-08 | 2023-09-08 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
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| CN101872958A (en) * | 2010-01-14 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Input voltage under-voltage protection circuit of switching power supply |
| CN102780207A (en) * | 2011-05-09 | 2012-11-14 | 鸿富锦精密工业（深圳）有限公司 | Voltage protection system and voltage protection method |
| CN102789299A (en) * | 2011-05-18 | 2012-11-21 | 鸿富锦精密工业（深圳）有限公司 | CPU voltage protecting circuit |
| US20120320481A1 (en) * | 2011-06-16 | 2012-12-20 | Fairchild Semiconductor Corporation | Protection System |
| WO2015051688A1 (en) * | 2013-10-09 | 2015-04-16 | 珠海格力电器股份有限公司 | Protective circuit for input voltage of switch power source |
| CN208767771U (en) * | 2018-08-27 | 2019-04-19 | 惠州市康冠科技有限公司 | Over-and under-voltage protects circuit |
| CN208923882U (en) * | 2018-11-22 | 2019-05-31 | 无锡全裕电子科技有限公司 | One kind passing through single-chip microcontroller automatic shutoff energy-saving circuit module |
| CN109873398A (en) * | 2019-02-21 | 2019-06-11 | 广州视源电子科技股份有限公司 | Chip under-voltage protecting circuit and chip circuit |
| CN210867170U (en) * | 2019-07-04 | 2020-06-26 | 昂宝电子（上海）有限公司 | Input alternating voltage undervoltage and overvoltage protection circuit |
| CN217956682U (en) * | 2022-06-08 | 2022-12-02 | 深圳市振华微电子有限公司 | Protective circuit |
-
2023
- 2023-09-08 CN CN202311153142.7A patent/CN116885669B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872958A (en) * | 2010-01-14 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Input voltage under-voltage protection circuit of switching power supply |
| CN102780207A (en) * | 2011-05-09 | 2012-11-14 | 鸿富锦精密工业（深圳）有限公司 | Voltage protection system and voltage protection method |
| CN102789299A (en) * | 2011-05-18 | 2012-11-21 | 鸿富锦精密工业（深圳）有限公司 | CPU voltage protecting circuit |
| US20120320481A1 (en) * | 2011-06-16 | 2012-12-20 | Fairchild Semiconductor Corporation | Protection System |
| WO2015051688A1 (en) * | 2013-10-09 | 2015-04-16 | 珠海格力电器股份有限公司 | Protective circuit for input voltage of switch power source |
| CN208767771U (en) * | 2018-08-27 | 2019-04-19 | 惠州市康冠科技有限公司 | Over-and under-voltage protects circuit |
| CN208923882U (en) * | 2018-11-22 | 2019-05-31 | 无锡全裕电子科技有限公司 | One kind passing through single-chip microcontroller automatic shutoff energy-saving circuit module |
| CN109873398A (en) * | 2019-02-21 | 2019-06-11 | 广州视源电子科技股份有限公司 | Chip under-voltage protecting circuit and chip circuit |
| CN210867170U (en) * | 2019-07-04 | 2020-06-26 | 昂宝电子（上海）有限公司 | Input alternating voltage undervoltage and overvoltage protection circuit |
| CN217956682U (en) * | 2022-06-08 | 2022-12-02 | 深圳市振华微电子有限公司 | Protective circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116885669B (en) | 2024-01-12 |
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