CN214900186U

CN214900186U - Overvoltage voltage stabilizing circuit with abnormal output alarm function

Info

Publication number: CN214900186U
Application number: CN202120505831.XU
Authority: CN
Inventors: 高兆华; 刘万斌; 段廷文
Original assignee: Shandong Feiyue Electronics Technology Co ltd
Current assignee: Shandong Feiyue Electronics Technology Co ltd
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-11-26
Anticipated expiration: 2031-03-10

Abstract

When the external input voltage is higher than the set protection output voltage, a voltage comparator I outputs a high level, an NPN triode is conducted under the action of a pull-up resistor III, the grid of an NMOS tube obtains 12V voltage, the NMOS tube is conducted, and the overvoltage voltage limiting function is achieved. After the NMOS tube is conducted, the output voltage of the voltage output end Vout is limited by a voltage regulator tube and does not rise along with the rise of the input voltage. The voltage-dividing circuit comprises a resistor VI, a resistor VII, a voltage-dividing voltage-stabilizing tube, a resistor IX and a resistor X, wherein the voltage-dividing voltage-stabilizing tube is used as an input reference voltage of a voltage comparator II, the voltage-dividing voltage-stabilizing tube is used as another voltage-dividing voltage of the voltage comparator II, and the voltage-dividing circuit is mainly used for prompting and alarming when output is abnormal. Meanwhile, the functions of alarming for abnormal output, protecting a subsequent circuit and stabilizing voltage output are realized.

Description

Overvoltage voltage stabilizing circuit with abnormal output alarm function

Technical Field

The utility model relates to a circuit protection technical field, concretely relates to excessive pressure voltage stabilizing circuit of unusual output warning.

Background

In our production and life, the input voltage of the equipment used exceeds the upper limit value required by our equipment for various reasons, such as storage battery and abnormal output voltage. Some batteries, when fully charged, may exceed specification values much, and for some control circuits performance may be directly affected, and if selected devices do not match, device damage may result, affecting the use of the device. Therefore, in order to cope with the occurrence of the overvoltage condition, the voltage output of the control circuit needs to be limited for stable use.

Disclosure of Invention

The utility model discloses an overcome not enough of above technique, provide one kind to the circuit play protection and steady voltage, to the abnormal output of voltage output be the warning suggestion the excessive pressure voltage stabilizing circuit that abnormal output reported to the police.

The utility model overcomes the technical scheme that its technical problem adopted is:

an overvoltage voltage stabilizing circuit for abnormal output alarm, comprising:

the voltage comparator I is connected with a power supply VCC through a resistor I and grounded through a resistor II at the positive input end thereof, connected with a signal output end of a comparison reference voltage through a resistor IV and grounded through a resistor V at the negative input end thereof, and connected with a power supply V1 through a resistor III at the output end thereof;

the collector of the NPN triode is connected with a 12V power supply, the base of the NPN triode is connected with the output end of the voltage comparator I, and the emitter of the NPN triode is connected with one end of a resistor VI;

the negative-phase input end of the voltage comparator II is connected to the other end of the resistor VI and grounded through the resistor VII, the non-negative-phase input end of the voltage comparator II is grounded, the output end of the voltage comparator II is connected to the cathode of the LED, and the anode of the LED is connected to a power supply V1 through a resistor XI;

and the drain electrode of the NMOS tube is respectively connected with a power supply VCC and the voltage output end Vout, the source electrode of the NMOS tube is connected with the negative electrode of the voltage regulator tube, the positive electrode of the voltage regulator tube is grounded, and the grid electrode of the NMOS tube is connected with the emitting electrode of the NPN triode.

Preferably, the voltage comparator further comprises a resistor X, and the non-inverting input terminal of the voltage comparator II is grounded through the resistor X.

Preferably, the power supply further comprises a resistor VIII, and the drain electrode of the NMOS transistor is connected to a power supply VCC through the resistor VIII.

Preferably, the voltage comparator further comprises a resistor IX, one end of the resistor IX is connected to the source electrode of the NMOS tube, and the other end of the resistor IX is connected to the non-inverting input end of the voltage comparator II.

The utility model has the advantages that: when the external input voltage is higher than the set protection output voltage, the voltage comparator I outputs a high level, the NPN triode is conducted under the action of the pull-up resistor III, the grid electrode of the NMOS tube obtains a voltage of 12V, the NMOS tube is conducted, and the overvoltage and voltage limiting function is achieved. After the NMOS tube is conducted, the output voltage of the voltage output end Vout is limited by a voltage regulator tube and does not rise along with the rise of the input voltage. The voltage-dividing circuit comprises a resistor VI, a resistor VII, a voltage-dividing voltage-stabilizing tube, a resistor IX and a resistor X, wherein the voltage-dividing voltage-stabilizing tube is used as an input reference voltage of a voltage comparator II, the voltage-dividing voltage-stabilizing tube is used as another voltage-dividing voltage of the voltage comparator II, and the voltage-dividing circuit is mainly used for prompting and alarming when output is abnormal. Meanwhile, the functions of alarming for abnormal output, protecting a subsequent circuit and stabilizing voltage output are realized.

Drawings

FIG. 1 is a circuit diagram of the present invention;

in the figure, 1, a resistor I2, a resistor II 3, a voltage comparator I4, a resistor III 5, a resistor IV 6, a resistor V7, an NPN triode 8, a resistor VI 9, a resistor VII 10, a resistor VIII 11, an NMOS tube 12, a voltage regulator tube 13, a resistor IX 14, a resistor X15, a voltage comparator II 16, a resistor XI 17 and an LED.

Detailed Description

The present invention will be further explained with reference to fig. 1.

An overvoltage voltage stabilizing circuit for abnormal output alarm, comprising: the positive phase input end of the voltage comparator I3 is connected to a power supply VCC through a resistor I1 and is grounded through a resistor II 2, the negative phase input end of the voltage comparator I3 is connected to a signal output end of a comparison reference voltage through a resistor IV 5 and is grounded through a resistor V6, and the output end of the voltage comparator I is connected to a power supply V1 through a resistor III 4; an NPN triode 7, the collector of which is connected with a 12V power supply, the base of which is connected with the output end of the voltage comparator I3, and the emitter of which is connected with one end of a resistor VI 8; the inverting input end of the voltage comparator II 15 is respectively connected to the other end of the resistor VI 8 and grounded through the resistor VII 9, the non-inverting input end of the voltage comparator II is grounded, the output end of the voltage comparator II is connected to the cathode of the LED17, and the anode of the LED17 is connected to a power supply V1 through a resistor XI 16; the drain of the NMOS transistor 11 is connected to the power source VCC and the voltage output terminal Vout, the source thereof is connected to the negative electrode of the regulator tube 12, the positive electrode of the regulator tube 12 is grounded, and the gate thereof is connected to the emitter of the NPN transistor 7. The resistor IV 5 and the resistor V6 divide voltage to obtain a comparative reference voltage, namely a correspondingly arranged protection output voltage, and the resistor I1 and the resistor II 2 divide voltage to obtain a corresponding value of an external input voltage. When the external input voltage is lower than the set protection output voltage, the voltage comparator I1 outputs a low level, the output voltage of the voltage output end Vout is consistent with the external input voltage, and the output voltage stabilization does not work. When the external input voltage is higher than the set protection output voltage, the voltage comparator I1 outputs a high level, the NPN triode 7 is conducted under the action of the pull-up resistor III 4, the grid electrode of the NMOS tube 11 obtains 12V voltage, the NMOS tube 11 is conducted, and the overvoltage and voltage limiting function is achieved. After the NMOS tube 11 is conducted, the output voltage of the voltage output end Vout is limited by the voltage regulator tube 12 and does not increase along with the increase of the input voltage. The voltage-divided voltage of the resistor VI 8 and the resistor VII 9 is used as the input reference voltage of the voltage comparator II 15, the voltage-divided voltage of the voltage-stabilized tube 21 is divided by the resistor IX 13 and the resistor X14 and is used as the other divided voltage of the voltage comparator II 15, and the comparator has the main function of prompting and alarming when the output is abnormal. After overvoltage is input, the non-inverting input end of the voltage comparator II 15 is larger than the inverting input end under normal conditions, the output end of the voltage comparator II 15 outputs high level, and the LED17 does not work. If the voltage regulator tube 12 is broken down, the non-inverting input end of the voltage comparator II 15 becomes low level and is lower than the reference voltage of the inverting input end of the voltage comparator II 15, the output end of the voltage comparator II 15 outputs low level, the LED17 is lightened, and an alarm is given. If the voltage regulator tube 12 is burnt to cause open circuit, the non-inverting input end of the voltage comparator II 15 is still lower than the voltage of the inverting input end thereof, the output end of the voltage comparator II 15 outputs low level, and the LED17 is lightened to give an alarm. Meanwhile, the functions of alarming for abnormal output, protecting a subsequent circuit and stabilizing voltage output are realized.

Further, the voltage comparator ii 15 further includes a resistor x 14, and the non-inverting input terminal of the voltage comparator ii 15 is grounded via the resistor x 14. The resistor X14 serves for voltage division.

Further, the power supply further comprises a resistor VIII 10, and the drain electrode of the NMOS tube 11 is connected to a power supply VCC through the resistor VIII 10. The resistor VIII 10 serves for voltage division.

Further, the voltage comparator further comprises a resistor IX 13, wherein one end of the resistor IX 13 is connected to the source electrode of the NMOS tube 11, and the other end of the resistor IX 13 is connected to the non-inverting input end of the voltage comparator II 15. The resistor IX 13 is used for voltage division.

Claims

1. The utility model provides an overvoltage voltage stabilizing circuit that unusual output was reported to police which characterized in that includes:

the voltage comparator I (3) is connected with a power supply VCC through a resistor I (1) and is grounded through a resistor II (2) at a positive phase input end thereof, is connected with a signal output end of a comparison reference voltage through a resistor IV (5) and is grounded through a resistor V (6) at a negative phase input end thereof, and is connected with a power supply V1 through a resistor III (4) at an output end thereof;

an NPN triode (7), the collector of which is connected with a 12V power supply, the base of which is connected with the output end of the voltage comparator I (3), and the emitter of which is connected with one end of a resistor VI (8);

the inverting input end of the voltage comparator II (15) is respectively connected to the other end of the resistor VI (8) and is grounded through a resistor VII (9), the non-inverting input end of the voltage comparator II is grounded, the output end of the voltage comparator II is connected to the cathode of the LED (17), and the anode of the LED (17) is connected to a power supply V1 through a resistor XI (16);

and the drain electrode of the NMOS tube (11) is respectively connected with a power supply VCC and the voltage output end Vout, the source electrode of the NMOS tube is connected with the negative electrode of the voltage regulator tube (12), the positive electrode of the voltage regulator tube (12) is grounded, and the grid electrode of the NMOS tube is connected with the emitting electrode of the NPN triode (7).

2. The overvoltage voltage regulator circuit with abnormal output alarm of claim 1, wherein: the circuit also comprises a resistor X (14), and the non-inverting input end of the voltage comparator II (15) is grounded through the resistor X (14).

3. The overvoltage voltage regulator circuit with abnormal output alarm of claim 1, wherein: the power supply further comprises a resistor VIII (10), and the drain electrode of the NMOS tube (11) is connected to a power supply VCC through the resistor VIII (10).

4. The overvoltage voltage regulator circuit with abnormal output alarm of claim 1, wherein: the voltage comparator further comprises a resistor IX (13), one end of the resistor IX (13) is connected to the source electrode of the NMOS tube (11), and the other end of the resistor IX is connected to the non-inverting input end of the voltage comparator II (15).