CN217215948U

CN217215948U - Overvoltage slow recovery protection circuit module

Info

Publication number: CN217215948U
Application number: CN202220953259.8U
Authority: CN
Inventors: 饶明君; 孟祥冬; 王金刚
Original assignee: CETC 58 Research Institute
Current assignee: CETC 58 Research Institute
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-08-16
Anticipated expiration: 2032-04-24

Abstract

The utility model relates to an overvoltage slow recovery protection circuit module, which comprises an input voltage sampling circuit, a voltage reference control circuit and an output enabling control circuit, wherein the input voltage sampling circuit is used for detecting the size of input voltage and inputting the detected voltage to a reverse phase input end 2 pin of a comparator; the voltage reference control circuit is used for providing a reference of comparison voltage; the output enable control circuit is used for controlling the output circuit. The utility model provides a power overvoltage point and excessive pressure restore point near critical point protection action problem of switching of beating repeatedly, this circuit is simple, and voltage restore point can freely set for, need not increase advantages such as auxiliary circuit, has improved power supply circuit's security and stability.

Description

Overvoltage slow recovery protection circuit module

Technical Field

The utility model belongs to the technical field of the integrated circuit technique and specifically relates to indicate an excessive pressure slow recovery protection circuit module.

Background

The power supply is used as power supply equipment of all electronic products, and besides the performance of the power supply needs to meet the requirements of the power supply products, the protection measures of the power supply are very important, such as overvoltage, overcurrent and overheat protection. Once an electronic product fails, if the input voltage of the electronic product is too high, the power supply must be shut down to prevent the power MOSFET and the output device from being burnt, otherwise, the electronic product may be further damaged, and even electric shock and fire of an operator may occur, and the system is restarted after the voltage is restored to a safe range. Therefore, the overvoltage protection function of the power supply must be completed. The main disadvantages of the prior art are:

(1) the overvoltage point and the overvoltage recovery point are the same point, and when the voltage reaches a critical point, the phenomenon of repeated jumping switching of overvoltage protection and overvoltage recovery states exists, so that the normal operation of equipment is influenced.

(2) Part design is as follows: the overvoltage point detection circuit and the overvoltage recovery detection circuit are designed independently. Resulting in higher equipment cost, complex circuit design and affecting the safety of the circuit.

Therefore, a solution of an over-voltage slow recovery protection circuit with a simple circuit and a freely settable protection voltage is needed.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model discloses an excessive pressure slow recovery protection circuit module, constitute including input voltage sampling circuit, voltage reference control circuit, output enable control circuit triplex. The input voltage sampling circuit is used for detecting the magnitude of the input voltage and inputting the detected voltage to the pin 2 of the inverting input end of the comparator. The voltage reference control circuit is used for providing a reference for comparing the voltage. The output enable control circuit is used for controlling the output circuit.

As an optimized technical solution of the present invention, the input voltage sampling circuit specifically includes four parts, namely, a positive electrode Vin of the input voltage, a first resistor R1, a second resistor R2, and a comparator U1. The positive electrode Vin of the input voltage is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a second resistor R2 and the pin 2 of the inverting input end of the U1, and the other end of the second resistor R2 is grounded.

As an optimized technical solution of the present invention, the voltage reference control circuit specifically includes four parts, namely, a 5V reference voltage, a third resistor R3, a fourth resistor R4, and a comparator U1. The anode of the 5V reference voltage is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with one end of a fourth resistor R4 and a pin 1 of the non-inverting input end of a comparator U1, and the other end of the fourth resistor R4 is connected with a pin 4 of the output end of the comparator U1 and the base of a PNP triode Q1.

As an optimal technical scheme of the utility model, output enable control circuit includes fourth resistance R4, comparator U1, switch tube Q1 and controller enable port circuit four bibliographic categories branch, and fourth resistance R4 links to each other with 4 feet of output and PNP triode Q1's of comparator U1 base, and 2 feet of Q1 link to each other with controller enable port circuit, and 3 feet ground connection of Q1.

As a preferred technical solution of the present invention, the comparator U1 adopts a TLV1701 comparator.

As an optimized technical solution of the utility model, the switch tube Q1 adopts the PNP triode.

The beneficial effects of the utility model are that: the utility model provides a power overvoltage point and excessive pressure restore point near critical point protection action problem of switching of beating repeatedly, this circuit is simple, and voltage restore point can freely set for, need not increase advantages such as auxiliary circuit, has improved power supply circuit's security and stability.

Drawings

In order to make the content of the present invention more clearly understood, the present invention will be described in further detail with reference to the following embodiments of the present invention, in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of an overvoltage slow recovery protection circuit module according to the present invention;

fig. 2 is a schematic block diagram of the comparator according to the present invention.

Detailed Description

As shown in fig. 1 and fig. 2, this embodiment provides an implementation manner of an over-voltage and slow-recovery protection circuit module, which includes an input voltage sampling circuit, a voltage reference control circuit, and an output enable control circuit. The input voltage sampling circuit is used for detecting the magnitude of the input voltage and inputting the detected voltage to the pin 2 of the inverting input end of the comparator. The voltage reference control circuit is used for providing a reference for comparing the voltage. The output enable control circuit is used for controlling the output circuit.

In order to further optimize the implementation effect of the present invention, in another embodiment of the present invention, based on the foregoing, the input voltage sampling circuit specifically includes four parts, namely, a positive electrode Vin of the input voltage, a first resistor R1, a second resistor R2, and a comparator U1. The positive electrode Vin of the input voltage is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a second resistor R2 and the pin 2 of the inverting input end of the U1, and the other end of the second resistor R2 is grounded.

The working principle of the input voltage sampling circuit is as follows: the input voltage Vin is divided by the sampling resistors R1 and R2, and then the voltage parameter is sent to the inverting input terminal 2 pin of the comparator U1 to be compared with the reference voltage of the 1 pin, if the voltage is higher than the voltage of the 1 pin, a low level is output, and if the voltage is lower than the voltage of the 1 pin, a high level is output, so that the enable circuit is controlled.

The voltage reference control circuit specifically comprises a 5V reference voltage, a third resistor R3, a fourth resistor R4 and a comparator U1. The anode of the 5V reference voltage is connected with one end of a third resistor R3, the other end of the third resistor R3 is connected with one end of a fourth resistor R4 and a pin 1 of the non-inverting input end of a comparator U1, and the other end of the fourth resistor R4 is connected with a pin 4 of the output end of the comparator U1 and the base of a PNP triode Q1.

The working principle of the voltage reference control circuit is as follows: the 5V reference voltage is divided by sampling resistors R3 and R4, and then the voltage parameter is sent to a non-inverting input terminal pin 1 of a comparator U1 to be compared with the input voltage of a pin 2, if the voltage is higher than the pin 2 voltage, a high level is output, and if the voltage is lower than the pin 2 voltage, a low level is output, so that the enabling circuit is controlled.

The output enable control circuit comprises four parts of a fourth resistor R4, a comparator U1, a switch tube Q1 and a controller enable port circuit, the fourth resistor R4 is connected with the output end 4 pin of the comparator U1 and the base electrode of a PNP triode Q1, the pin 2 of Q1 is connected with the controller enable port circuit, and the pin 3 of Q1 is grounded.

The working principle of the output enabling control circuit is as follows: when 4 pins of the output end of the comparator U1 output high level, the switching tube Q1 is turned off, the enable end of the power supply controller is at high level, and the power supply controller works normally; when 4 pins of the output end of the comparator U1 output low level, the switch tube Q1 is conducted, the enable end of the power supply controller is at low level, and the power supply controller stops working.

It should be noted that when the voltage of the 4-pin at the output terminal of the comparator U1 changes, the reference voltage of the 1-pin also changes, so as to achieve the purpose of recovering the output voltage after the input voltage falls to the safety range.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.

Claims

1. An overvoltage slow recovery protection circuit module is characterized by comprising an input voltage sampling circuit, a voltage reference control circuit and an output enabling control circuit, wherein the input voltage sampling circuit comprises an input voltage, a resistance voltage division sampling circuit and a comparator, the input voltage is subjected to resistance voltage division and then is input to a pin 2 at the inverting input end of the comparator and is compared with a reference voltage at a pin 1 at the non-inverting input end of the comparator, so that the state of a pin 4 at the output end of the comparator is controlled;

the voltage reference control circuit consists of a 5V reference voltage, a divider resistor and a comparator, and the reference voltage of the pin 1 of the comparator is changed through the state of the pin 4 of the output end of the comparator, so that the requirement of overvoltage slow recovery control is met;

the output enable control circuit is composed of a pin 4 of an output end of the comparator, the PNP triode and the output enable interface of the controller, the pin 4 of the output end of the comparator sends out a control signal according to a circuit state, and control of an enable port of the control circuit is achieved through the switch Q1.

2. The protection circuit module of claim 1, wherein: the input voltage sampling circuit is internally provided with an anode Vin of input voltage, a first resistor R1, a second resistor R2 and a comparator U1, the anode Vin of the input voltage is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with one end of the second resistor R2 and the 2-pin of the inverting input end of the U1, and the other end of the second resistor R2 is grounded.

3. The protection circuit module of claim 1, wherein: the voltage reference control circuit is internally provided with a 5V reference voltage, a third resistor R3, a fourth resistor R4 and a comparator U1, the positive pole of the 5V reference voltage is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the fourth resistor R4 and the pin 1 of the non-inverting input end of the comparator U1, and the other end of the fourth resistor R4 is connected with the pin 4 of the output end of the comparator U1 and the base of a PNP triode Q1.

4. The protection circuit module of claim 1, wherein: the output enable control circuit is internally provided with a fourth resistor R4, a comparator U1, a switch tube Q1 and a controller enable port circuit, the fourth resistor R4 is connected with the output end 4 pin of the comparator U1 and the base electrode of a PNP triode Q1, the pin 2 of Q1 is connected with the controller enable port circuit, and the pin 3 of Q1 is grounded.

5. The module of claim 4, wherein: the switching tube Q1 may be a PNP transistor, an NPN transistor, or a MOS transistor.