CN109728564A - A kind of circuit overcurrent protective device and method - Google Patents
A kind of circuit overcurrent protective device and method Download PDFInfo
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- CN109728564A CN109728564A CN201811628208.2A CN201811628208A CN109728564A CN 109728564 A CN109728564 A CN 109728564A CN 201811628208 A CN201811628208 A CN 201811628208A CN 109728564 A CN109728564 A CN 109728564A
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- overcurrent protection
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Abstract
The invention discloses a kind of circuit overcurrent protective device and methods.It is related to circuit fuse protection technology, solves the problems, such as that fixed blow-out current value causes to remove safely and suffer from.Device, including electrical fuse protection circuital current setting resistance, voltage branch circuit, single order overcurrent protection resistance adjustment circuit and second order overcurrent protection resistance adjustment circuit.Technical solution provided by the invention is protected suitable for electronic device circuitry, realizes the fuse protection scheme for adapting to voltage change scene.
Description
Technical field
The present invention relates to circuit fuse protection technology, espespecially a kind of circuit overcurrent protective device and method.
Background technique
Existing electrical fuse protection circuit carrys out overcurrent protection when initialization circuit work by the outer connecting resistance of corresponding pin
Electric current just secures protective current value after selected corresponding resistance, but since circuit is in rigid start to work, output electricity
It forces down but bigger to output capacitor charging bring surge current, bigger mistake can only be arranged in false triggering in order to prevent
Protection value is flowed, but after working normally, output voltage reaches preset value, but far smaller than overcurrent protection is set current value again
Value, causes over-current protection point excessively high, when occurring abnormal, can not protect, bring to system reliability and stability huge in time
Big hidden danger.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of circuit overcurrent protective device and methods.By in electricity
The resistance of the fuse protected circuital current setting resistor in parallel difference resistance value of son, protects circuit to the electrical fuse according to voltage condition
Current setting resistor carries out divided current, solves the problems, such as that fixed blow-out current value causes to remove safely and suffers from.
In order to reach the object of the invention, the present invention provides a kind of circuit overcurrent protective devices, including electrical fuse to protect
Circuital current sets resistance, voltage branch circuit, single order overcurrent protection resistance adjustment circuit and second order overcurrent protection resistance adjustment
Circuit；
The overcurrent protection setting that fuse protected switch is loaded on the electrical fuse protection circuital current setting resistance is drawn
The voltage of foot Shtdwn pin output；
The voltage branch circuit includes concatenated first capacitor and the second capacitor, and first capacitor is flanked protects into the fuse
Protect the output voltage of switch；
The single order overcurrent protection resistance adjustment circuit includes the first adjusting resistance, the single order overcurrent protection resistance adjustment
Circuit according to the first capacitor and the second capacitor intermediate point output voltage values control described first adjust resistance with it is described
Electrical fuse protects circuital current setting resistor coupled in parallel or disconnection；
The second order overcurrent protection resistance adjustment circuit includes the second adjusting resistance, the second order overcurrent protection resistance adjustment
Circuit the second adjusting resistance and electrical fuse according to the output voltage control of the fuse protected switch protect circuit
Current setting resistor is in parallel or disconnects.
Preferably, the single order overcurrent protection resistance adjustment circuit further include:
Concatenated first resistor, second resistance,
First comparator and the first conducting switch being connect with the first comparator output end；
It is loaded with input voltage on the series circuit of the first resistor and second resistance, from the first resistor and institute
The intermediate point for stating second resistance is drawn output voltage all the way and is inputted as the negative terminal of the first comparator, from the first capacitor
Anode input of the output voltage as the first comparator all the way is drawn with the intermediate point of the second capacitor；
When first comparator anode input is higher than negative terminal input, first comparator triggering first conducting
Switch conduction, described first adjusts resistance and electrical fuse protection circuital current setting resistor coupled in parallel.
Preferably, the second order overcurrent protection resistance adjustment circuit further include:
Concatenated 3rd resistor, the 4th resistance,
Second comparator and the second conducting switch being connect with second comparator output terminal；
It is loaded with input voltage on the series circuit of the 3rd resistor and the 4th resistance, from the 3rd resistor and institute
The intermediate point for stating the 4th resistance is drawn output voltage all the way and is inputted as the negative terminal of second comparator, with fuse protected switch
Shtdwn pin output voltage as second comparator anode input；
When the second comparator anode input is higher than negative terminal input, the second comparator triggering second conducting
Switch conduction, described second adjusts resistance and electrical fuse protection circuital current setting resistor coupled in parallel.
Preferably, the first conducting switch and the second conducting switch are N-channel reinforced metal-oxide half
Conductor field effect transistor.
The present invention also provides a kind of circuit over-current protection methods using foregoing circuit overcurrent protective device, comprising:
When output voltage is higher than the first protection threshold value, single order overcurrent protection resistance adjustment circuit is triggered；
Resistance is adjusted by first and electrical fuse protection circuital current sets resistor coupled in parallel, and electricity is protected to the electrical fuse
Road current setting resistor is shunted.
Preferably, resistance is adjusted by first and electrical fuse protection circuital current sets resistor coupled in parallel, it is molten to the electronics
After the step of silk protection circuital current setting resistance is shunted, further includes:
When output voltage continues to increase more than the second protection threshold value, single order overcurrent protection resistance adjustment circuit is triggered；
Resistance, the first adjusting resistance and electrical fuse protection circuital current setting resistance are adjusted simultaneously for second
Connection shunts electrical fuse protection circuital current setting resistance.
The present invention provides a kind of circuit overcurrent protective device and methods, add voltage branch circuit, single order overcurrent protection
Resistance adjustment circuit and second order overcurrent protection resistance adjustment circuit, by concatenated first capacitor in the voltage branch circuit and
Second capacitor starts the single order overcurrent protection resistance adjustment circuit and second order overcurrent protection resistance adjustment circuit stage by stage, to institute
It states electrical fuse protection circuital current setting resistance and carries out parallel shunt.It solves fixed blow-out current value to cause safely except trouble
Problem realizes the fuse protection scheme for adapting to voltage change scene.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand technical solution of the present invention, and constitutes part of specification, with this
The embodiment of application technical solution for explaining the present invention together, does not constitute the limitation to technical solution of the present invention.
Fig. 1 is existing fixed current mode schematic illustration；
Fig. 2 is a kind of structural schematic diagram for circuit overcurrent protective device that one embodiment of the invention provides；
Fig. 3 is a kind of circuit diagram for circuit overcurrent protective device that one embodiment of the invention provides；
Fig. 4 is a kind of flow diagram for circuit over-current protection method that one embodiment of the invention provides.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
Step shown in the flowchart of the accompanying drawings can be in a computer system such as a set of computer executable instructions
It executes.Also, although logical order is shown in flow charts, and it in some cases, can be to be different from herein suitable
Sequence executes shown or described step.
Existing technology is all fixed overcurrent protection electric current to correspond to all output environments, as shown in Figure 1, can not be according to not
Corresponding protection setting is used with situation, huge hidden danger is brought to system reliability and stability.
To solve the above-mentioned problems, the embodiment provides a kind of circuit overcurrent protective device and methods.Pass through
In the resistance of electrical fuse protection circuital current setting resistor in parallel difference resistance value, the electrical fuse is protected according to voltage condition
Circuital current sets resistance and carries out divided current, solves the problems, such as that fixed blow-out current value causes to remove safely and suffers from.
One embodiment of the invention provides a kind of circuit overcurrent protective device, and structure is as shown in Figure 2.
Detailed circuit is as shown in figure 3, include that electrical fuse protection circuital current sets resistance R7, voltage branch circuit, one
Rank overcurrent protection resistance adjustment circuit and second order overcurrent protection resistance adjustment circuit；
The overcurrent protection setting that fuse protected switch is loaded on the electrical fuse protection circuital current setting resistance is drawn
The voltage of foot Shtdwn pin output；
The voltage branch circuit includes concatenated first capacitor C1 and the second capacitor C2, and first capacitor C1 is flanked into described
The output voltage V_out of fuse protected switch；
The single order overcurrent protection resistance adjustment circuit includes the first adjusting resistance R5, the single order overcurrent protection resistance tune
Road economize on electricity according to the first capacitor C1 and the second capacitor C2 intermediate point output voltage values control the first adjusting resistance
R5 and electrical fuse protection circuital current setting resistor coupled in parallel or disconnection；
The second order overcurrent protection resistance adjustment circuit includes the second adjusting resistance R6, the second order overcurrent protection resistance tune
Economize on electricity road second adjusting resistance R6 and electrical fuse protection according to the output voltage control of the fuse protected switch
Circuital current sets resistance R7 parallel connection or disconnects.
Preferably, the single order overcurrent protection resistance adjustment circuit further include:
Concatenated first resistor R1, second resistance R2,
First comparator M1 and the first conducting switch Q1 being connect with the first comparator M1 output end；
Input voltage V is loaded on the series circuit of the first resistor R1 and second resistance R2in, from first electricity
The intermediate point for hindering the R1 and second resistance R2 is drawn output voltage all the way and is inputted as the negative terminal of the first comparator M1, from
The intermediate point of the first capacitor C1 and the second capacitor C2 draw anode of the output voltage as the first comparator M1 all the way
Input；
When first comparator M1 anode input is higher than negative terminal input, the first comparator M1 triggering described first
Switch Q1 conducting is connected, described first adjusts resistance R5 protects circuital current setting resistance R7 in parallel with the electrical fuse.
Preferably, the second order overcurrent protection resistance adjustment circuit further include:
Concatenated 3rd resistor R3, the 4th resistance R4,
Second comparator M2 and the second conducting switch Q2 being connect with the second comparator M2 output end；
Input voltage V is loaded on the series circuit of the 3rd resistor R3 and the 4th resistance R4in, from the third electricity
The intermediate point for hindering R3 and the 4th resistance R4 is drawn output voltage all the way and is inputted as the negative terminal of the second comparator M2, with
The voltage of the Shtdwn pin output of fuse protected switch is inputted as the anode of the second comparator M2；
When the second comparator M2 anode input is higher than negative terminal input, the second comparator M2 triggering described second
Switch Q2 conducting is connected, described second adjusts resistance R6 protects circuital current setting resistance R7 in parallel with the electrical fuse.
Preferably, the first conducting switch and the second conducting switch are N-channel reinforced metal-oxide half
Conductor field effect transistor.
One embodiment of the invention additionally provides a kind of circuit overcurrent protective device, is still illustrated by taking Fig. 3 as an example, the dress
It sets and includes:
1, voltage branch circuit divides the output voltage threshold value that setting needs by capacitor C1 and C2, respectively to single order and
Second order overcurrent protection resistance adjustment circuit triggers single order and second-order circuit stage by stage as reference.
2, single order overcurrent protection resistance adjustment circuit, by comparator M1, N-mosfet Q1, resistance R1&R2, resistance R5 group
At, it is whether in parallel with R7 by the conducting and cut-off adjusting R5 of M1 control Q1, adjust the resistance of electrical fuse circuit overcurrent protection resistance
Value achievees the purpose that adjust overcurrent protection current value.The output voltage values that sample of forward end are compared by comparator M1, and it is defeated
Enter the partial pressure given threshold that voltage passes through resistance R1&R2, when the voltage of forward end is greater than the set value, the high electricity of comparator output
N-Mosfet Q1 is connected in pressure, and resistance R5 is in parallel with electrical fuse protection circuital current setting resistance R7, so that equivalent setting
Resistance is lower, and reduces protective current setting value, since sampled voltage is divided by capacitor C1 and C2, so single order adjusts circuit and can compare
Second order adjusts circuit and first triggers.
3, second order overcurrent protection resistance adjustment circuit, by comparator M2, N-mosfet Q2, resistance R3&R4, resistance R6 group
At, it is whether in parallel with R7 by the conducting and cut-off adjusting R6 of M2 control Q2, adjust the resistance of electrical fuse circuit overcurrent protection resistance
Value achievees the purpose that adjust overcurrent protection current value.The output voltage values that sample of forward end are compared by comparator M2, and it is defeated
Enter the partial pressure given threshold that voltage passes through resistance R3&R4, when the voltage of forward end is greater than the set value, the high electricity of comparator output
N-Mosfet Q2 is connected in pressure, and resistance R6 is in parallel with electrical fuse protection circuital current setting resistance R7, so that equivalent setting
Resistance is lower, and reduces protective current setting value, since sampled voltage is divided by capacitor C1 and C2, so single order adjusts circuit and can compare
Second order adjusts circuit and first triggers.
One embodiment of the invention additionally provides a kind of circuit over-current protection method, is provided using the embodiment of the present invention
Circuit overcurrent protective device, process are as shown in Figure 4, comprising:
Step 401, output voltage be higher than first protection threshold value when, trigger single order overcurrent protection resistance adjustment circuit.
In the embodiment of the present invention, according to the actual application, configuration electrical fuse protection circuital current sets resistance and one
The resistance value of each resistance in rank overcurrent protection resistance adjustment circuit.And be arranged first protection threshold value, with machine in due course start this one
Rank overcurrent protection resistance adjustment circuit sets shunt resistance to electrical fuse protection circuital current.
Step 402 adjusts resistance and electrical fuse protection circuital current setting resistor coupled in parallel by first, molten to the electronics
Silk protection circuital current setting resistance is shunted.
Step 403, output voltage continue increase be more than second protection threshold value when, triggering second order overcurrent protection resistance adjustment
Circuit.
In the embodiment of the present invention, according to the actual application, each resistance in second order overcurrent protection resistance adjustment circuit is configured
Resistance value.And the second protection threshold value is set, it is molten to electronics to start the second order overcurrent protection resistance adjustment circuit with machine in due course
Silk protection circuital current sets shunt resistance.
Step 404 adjusts resistance, the first adjusting resistance and electrical fuse protection circuital current setting by second
Resistor coupled in parallel shunts electrical fuse protection circuital current setting resistance.
The embodiment provides a kind of circuit overcurrent protective device and methods, add voltage branch circuit, single order
Overcurrent protection resistance adjustment circuit and second order overcurrent protection resistance adjustment circuit pass through in the voltage branch circuit concatenated
One capacitor and the second capacitor start the single order overcurrent protection resistance adjustment circuit and second order overcurrent protection resistance adjustment stage by stage
Circuit carries out parallel shunt to electrical fuse protection circuital current setting resistance.It solves fixed blow-out current value to cause
Safety realizes the fuse protection scheme for adapting to voltage change scene except the problem of suffering from.
Partial pressure control is connect by the detecting to output voltage, passes through single order and second order overcurrent protection resistance adjustment circuit in time
The resistance value that circuit adjusts circuit setting resistance is adjusted, the mesh for adjusting overcurrent protection current value in time according to output environment has been reached
's.The embodiment of the present invention provide technical solution structure it is simple, can Auto-Sensing, high reliablity can be according to output state
Overcurrent protection current value is automatically adjusted, can arbitrarily be adjusted.Can be used for it is various need using electrical fuse protect circuit electronics set
It is standby.
It will appreciated by the skilled person that whole or certain steps, system, dress in method disclosed hereinabove
Functional module/unit in setting may be implemented as software, firmware, hardware and its combination appropriate.In hardware embodiment,
Division between the functional module/unit referred in the above description not necessarily corresponds to the division of physical assemblies；For example, one
Physical assemblies can have multiple functions or a function or step and can be executed by several physical assemblies cooperations.Certain groups
Part or all components may be implemented as by processor, such as the software that digital signal processor or microprocessor execute, or by
It is embodied as hardware, or is implemented as integrated circuit, such as specific integrated circuit.Such software can be distributed in computer-readable
On medium, computer-readable medium may include computer storage medium (or non-transitory medium) and communication media (or temporarily
Property medium).As known to a person of ordinary skill in the art, term computer storage medium is included in for storing information (such as
Computer readable instructions, data structure, program module or other data) any method or technique in the volatibility implemented and non-
Volatibility, removable and nonremovable medium.Computer storage medium include but is not limited to RAM, ROM, EEPROM, flash memory or its
His memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storages, magnetic holder, tape, disk storage or other
Magnetic memory apparatus or any other medium that can be used for storing desired information and can be accessed by a computer.This
Outside, known to a person of ordinary skill in the art to be, communication media generally comprises computer readable instructions, data structure, program mould
Other data in the modulated data signal of block or such as carrier wave or other transmission mechanisms etc, and may include any information
Delivery media.
Claims (6)
1. a kind of circuit overcurrent protective device, which is characterized in that including electrical fuse protection circuital current setting resistance, voltage point
Volt circuit, single order overcurrent protection resistance adjustment circuit and second order overcurrent protection resistance adjustment circuit；
The overcurrent protection setting pin of fuse protected switch is loaded on the electrical fuse protection circuital current setting resistance
The voltage of Shtdwn pin output；
The voltage branch circuit includes concatenated first capacitor and the second capacitor, and first capacitor is flanked fuse protected to be opened into described
The output voltage of pass；
The single order overcurrent protection resistance adjustment circuit includes the first adjusting resistance, the single order overcurrent protection resistance adjustment circuit
Resistance and the electronics are adjusted according to the first capacitor and the second capacitor intermediate point output voltage values control described first
Fuse protected circuital current setting resistor coupled in parallel or disconnection；
The second order overcurrent protection resistance adjustment circuit includes the second adjusting resistance, the second order overcurrent protection resistance adjustment circuit
Second adjusts resistance and electrical fuse protection circuital current according to the output voltage control of the fuse protected switch
Set resistor coupled in parallel or disconnection.
2. circuit overcurrent protective device according to claim 1, which is characterized in that
The single order overcurrent protection resistance adjustment circuit further include:
Concatenated first resistor, second resistance,
First comparator and the first conducting switch being connect with the first comparator output end；
It is loaded with input voltage on the series circuit of the first resistor and second resistance, from the first resistor and described
The intermediate points of two resistance is drawn output voltage all the way and is inputted as the negative terminal of the first comparator, from the first capacitor and the
The intermediate point of two capacitors is drawn output voltage all the way and is inputted as the anode of the first comparator；
When first comparator anode input is higher than negative terminal input, first comparator triggering the first conducting switch
Conducting, described first adjusts resistance and electrical fuse protection circuital current setting resistor coupled in parallel.
3. circuit overcurrent protective device according to claim 1, which is characterized in that
The second order overcurrent protection resistance adjustment circuit further include:
Concatenated 3rd resistor, the 4th resistance,
Second comparator and the second conducting switch being connect with second comparator output terminal；
It is loaded with input voltage on the series circuit of the 3rd resistor and the 4th resistance, from the 3rd resistor and described
The intermediate point of four resistance is drawn output voltage all the way and is inputted as the negative terminal of second comparator, with fuse protected switch
The voltage of Shtdwn pin output is inputted as the anode of second comparator；
When the second comparator anode input is higher than negative terminal input, the second comparator triggering the second conducting switch
Conducting, described second adjusts resistance and electrical fuse protection circuital current setting resistor coupled in parallel.
4. circuit overcurrent protective device according to claim 2 or 3, which is characterized in that
The first conducting switch and the second conducting switch are N-channel reinforced metal-oxide semiconductor field effect
Transistor.
5. a kind of circuit overcurrent protection side using the circuit overcurrent protective device as described in any one of claim 1-4
Method characterized by comprising
When output voltage is higher than the first protection threshold value, single order overcurrent protection resistance adjustment circuit is triggered；
Resistance is adjusted by first and electrical fuse protection circuital current sets resistor coupled in parallel, to electrical fuse protection circuit electricity
Stream setting resistance is shunted.
6. circuit over-current protection method according to claim 5, which is characterized in that adjust resistance and electrical fuse for first
Protect circuital current set resistor coupled in parallel, to the electrical fuse protection circuital current setting resistance shunt the step of it
Afterwards, further includes:
When output voltage continues to increase more than the second protection threshold value, second order overcurrent protection resistance adjustment circuit is triggered；
Resistance, the first adjusting resistance and electrical fuse protection circuital current, which are adjusted, by second sets resistor coupled in parallel, it is right
The electrical fuse protection circuital current setting resistance is shunted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628208.2A CN109728564B (en) | 2018-12-28 | 2018-12-28 | Circuit overcurrent protection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811628208.2A CN109728564B (en) | 2018-12-28 | 2018-12-28 | Circuit overcurrent protection device and method |
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| Publication Number | Publication Date |
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| CN109728564A true CN109728564A (en) | 2019-05-07 |
| CN109728564B CN109728564B (en) | 2020-02-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111391611A (en) * | 2020-03-25 | 2020-07-10 | 广州华凌制冷设备有限公司 | Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium |
| CN112039042A (en) * | 2020-08-28 | 2020-12-04 | Oppo（重庆）智能科技有限公司 | Discharge circuit and electronic device |
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| WO2008132501A2 (en) * | 2007-04-26 | 2008-11-06 | Cambridge Semiconductor Limited | Switching power converters |
| CN107147094A (en) * | 2017-04-27 | 2017-09-08 | 华为技术有限公司 | Current-limiting protection circuit and guard method |
| CN107272858A (en) * | 2017-05-26 | 2017-10-20 | 郑州云海信息技术有限公司 | A kind of server adaptive overcurrent protection circuit and adaptive approach |
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| CN1866035A (en) * | 2005-12-05 | 2006-11-22 | 华为技术有限公司 | Overcurrent alarming circuit |
| WO2008132501A2 (en) * | 2007-04-26 | 2008-11-06 | Cambridge Semiconductor Limited | Switching power converters |
| CN107147094A (en) * | 2017-04-27 | 2017-09-08 | 华为技术有限公司 | Current-limiting protection circuit and guard method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111391611A (en) * | 2020-03-25 | 2020-07-10 | 广州华凌制冷设备有限公司 | Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium |
| CN111391611B (en) * | 2020-03-25 | 2021-10-22 | 广州华凌制冷设备有限公司 | Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium |
| CN112039042A (en) * | 2020-08-28 | 2020-12-04 | Oppo（重庆）智能科技有限公司 | Discharge circuit and electronic device |
| CN112039042B (en) * | 2020-08-28 | 2022-09-02 | Oppo（重庆）智能科技有限公司 | Discharge circuit and electronic device |
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| CN109728564B (en) | 2020-02-28 |
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