CN102820637A

CN102820637A - Circuit self-locking protective device with self-recovery function

Info

Publication number: CN102820637A
Application number: CN2012102983450A
Authority: CN
Inventors: 逯宗堂
Original assignee: Inspur Electronic Information Industry Co Ltd
Current assignee: Inspur Electronic Information Industry Co Ltd
Priority date: 2012-08-21
Filing date: 2012-08-21
Publication date: 2012-12-12
Anticipated expiration: 2032-08-21
Also published as: CN102820637B

Abstract

The invention provides a circuit self-locking protective device with a self-recovery function, which comprises an adjustable over current protection (OCP) point circuit and a self-locking circuit C, wherein the adjustable OCP point circuit consists of a voltage amplifier A and a comparator B; the amplifier A consists of an integrated circuit U1, a capacitor C1 and a resistor R1, pins 1 and 2 of the U1 are grounded in parallel, a pin 3 of the U1 is connected with a power supply P5V_AUX, pins 4 and 5 of the U1 are respectively connected with two paths of Bigcurrent access, a pin 6 of the U1 is connected with a pin 3 of the integrated circuit U2 of the comparator; and the comparator B consists of the integrated circuit U2 and resistors R2-R4, wherein a pin 4 is connected with the resistor R2 in series to be grounded, meanwhile, the resistor R3 is connected with the power supply P5V_AUX, a pin 2 is connected with the power supply P5V_AUX, a pin 5 is grounded, and a pin 1 is connected with the resistors in series to be connected with the power supply P5V_AUX. The device can realize self-recovery when protecting the whole circuit from being damaged and eliminating faults; and in addition, the device has a function of protecting the safety of a user.

Description

A kind of circuit self-locking protecting device with self-recovering function

Technical field

The present invention relates to a kind of Computer Applied Technology field, specifically a kind of circuit self-locking protecting device with self-recovering function.

Background technology

People's life has now be unable to do without electronic product; And the fail safe of electronic product and people's life is also closely bound up; The research staff will consider when hardware breaks down when design; How to realize self-protection, protecting whole circuit to be without prejudice on the one hand can be from recovery when fixing a breakdown, and the opposing party protects end user's safety.Some famous brand products also propose higher requirement: smokelessly do not have fiery free from extraneous odour.So protection circuit is very important in hardware designs, current protection is a protection circuit part, and the main flow current protection generally adopts special-purpose protection chip or fuse now, and cost and design flexibility and recoverability are had a lot of drawbacks.

Summary of the invention

The purpose of this invention is to provide a kind of circuit self-locking protecting device with self-recovering function.

The objective of the invention is to realize, comprise scalable OCP dot circuit and latching circuit C by following mode, wherein:

1) scalable OCP dot circuit is made up of voltage amplifier A and comparator B; Wherein:

Amplifier A is made up of integrated circuit U1/ capacitor C 1/

resistance R

1,1, the 2 pin parallel connection ground connection of U1, and 3 pin meet power supply P5V_AUX, and 4,5 pin meet two-way Big current access respectively, and 6 pin connect 3 pin of comparator integrated circuit U2;

Comparator B is made up of integrated circuit U2 resistance R 2-R4, wherein: 4 pin crosstalks resistance R2 ground connection, the resistance R3 that conducts electricity simultaneously meets power supply P5V_AUX, and 2 pin meet power supply P5V_AUX, 5 pin ground connection, 1 pin crosstalk resistance meets power supply P5V_AUX;

2) latching circuit C is by triode Q1A, Q1B, Q2, diode D1, D2, and capacitor C 2, C3, resistance R 5 is formed; The positive pole of diode D1 connects 1 pin of integrated circuit U2, and negative pole connects 2 pin of triode Q1A, the 1 pin ground connection of triode Q1A; 6 pin crosstalks resistance R5 meets power supply P5V_AUX, and capacitor C 2 is connected between 2 pin and ground wire of triode Q1A, and diode D2 negative pole connects 2 pin of triode Q1A; Positive pole connects 3 pin of triode Q2, and the 2 pin crosstalks of triode Q2 are held C3 and met power supply P5V_AUX, and 1 pin of triode Q2 meets power supply P5V_AUX; 5 pin of triode Q1B connect 3 pin of triode Q2,4 pin ground connection, and 3 pin meet power supply POWER_EN;

The route protection method is following:

1) voltage amplifier U1 amplifies 50 times then, and exports a magnitude of voltage after the amplification through the voltage on the sampling precision resistance R8, and the magnitude of voltage of output is to be directly proportional with the magnitude of voltage on the precision resistance, is directly proportional with the current value that flows through in the circuit;

2) voltage after the top amplification is received the V+ of comparator; The voltage of V+ and the reference voltage on the V-pin are compared; Comparator output low level when the voltage of V+ is lower than the voltage of V-, comparator output high level combines circuit at the back can the Power on of system be dragged down when the voltage of V+ is higher than the power supply of V-; Make system cut-off; According to the trigger point that the value of regulating R3 and R2 disposes comparator, an also just corresponding current value of circuit, this value is exactly that we OCP that is provided with protects point;

3) when the V+ of comparator comparator output high level during greater than V-, at this moment the diode D1 of back will conducting, and then is triode Q1A conducting, and triode Q2 and 1QB also conducting drag down Power on, make system cut-off.Because the conducting of triode Q2, power supply 5V_AUX makes also conducting of diode D2, even the output high level of comparator has not existed, rear end Power on can be dragged down always, and circuit will be locked;

4) method that unlocks is exactly the power supply reset with P5V_STBY, and it is normal that circuit recovers.

The invention has the beneficial effects as follows: have on the one hand that the whole circuit of protection is without prejudice and can be from recovering when fixing a breakdown, the opposing party protects end user's safe functioning.Of the present invention have a low cost, is prone to regulate, and recovers certainly, and the protection circuit of lockout has good value for applications.

Description of drawings

Fig. 1 is the circuit theory diagrams with circuit self-locking protecting device of self-recovering function.

Embodiment

Explanation at length below with reference to Figure of description the circuit self-locking protecting device with self-recovering function of the present invention being done.

1) combines to form the circuit that scalable OCP is ordered with a voltage amplifier and comparator

2) form latching circuit with triode and diode

1, voltage amplifier U4 amplifies 50 times then through the voltage (generally having only tens millivolts) on the sampling precision resistance R8, and exports a magnitude of voltage after the amplification.The magnitude of voltage of output is to be directly proportional with the magnitude of voltage on the precision resistance, is directly proportional with the current value that flows through in the circuit;

2, the voltage after the top amplification is received the V+ of comparator; The voltage of V+ and the reference voltage on the V-pin are compared; Comparator output low level (system's operate as normal) when the voltage of V+ is lower than the voltage of V-; Comparator output high level combines circuit at the back can the Power on of system be dragged down when the voltage of V+ is higher than the power supply of V-, makes system cut-off.So the trigger point that can dispose comparator according to the value of regulating R26 and R30, an also just corresponding current value of circuit, this value is exactly that we OCP that is provided with protects point;

3, when the V+ of comparator comparator output high level during greater than V-, this is that the diode of back will conducting, and then is the conducting of Q133A triode, and Q20 and Q132B also conducting drag down Power on.Make system cut-off.Because the conducting of Q20,5V_AUX makes the also conducting of diode below the D4, even the output high level of comparator has not existed.Rear end Power on can be dragged down always, and circuit will be locked;

4, the method that unlocks is exactly the power supply reset with P5V_STBY, and it is normal that circuit recovers.

Except that the described technical characterictic of specification, be the known technology of those skilled in the art.

Claims

1. the circuit self-locking protecting device with self-recovering function is characterized in that comprising scalable OCP dot circuit and latching circuit C, wherein:

Amplifier A is made up of integrated circuit U1/ capacitor C 1/ resistance R 1,1, the 2 pin parallel connection ground connection of U1, and 3 pin meet power supply P5V_AUX, and 4,5 pin meet two-way Big current access respectively, and 6 pin connect 3 pin of comparator integrated circuit U2;

The route protection method is following:

3) when the V+ of comparator comparator output high level during greater than V-, at this moment the diode D1 of back will conducting, and then is triode Q1A conducting; Triode Q2 and 1QB also conducting drag down Power on, make system cut-off, because the conducting of triode Q2; Power supply 5V_AUX makes also conducting of diode D2; Even the output high level of comparator has not existed, rear end Power on can be dragged down always, and circuit will be locked;