CN107147284A - A kind of protection circuit and electric power system - Google Patents
A kind of protection circuit and electric power system Download PDFInfo
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- CN107147284A CN107147284A CN201610115319.8A CN201610115319A CN107147284A CN 107147284 A CN107147284 A CN 107147284A CN 201610115319 A CN201610115319 A CN 201610115319A CN 107147284 A CN107147284 A CN 107147284A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Abstract
The embodiment provides a kind of protection circuit and electric power system, it is related to electronic technology field, for while power supply unit is protected, continued power to be provided for electrical equipment.The protection circuit is arranged in current supply circuit, including：Current limliting module, control module, sampling module, current supply circuit includes first line and the second circuit, and first line is supply line, and current limliting module is arranged in first line, sampling module is arranged in the second circuit, and control module is connected respectively with current limliting module, detection module；Sampling module, the electric current for detecting the second circuit, and to control module output current sampling value；Control module, for according to current sampling value, to current limliting module output control information；Current limliting module, the current duty cycle for adjusting first line according to control information, the current duty cycle of first line is the ratio between ON time and turn-on cycle of the first line.Embodiments of the invention are used for protection circuit.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of protection circuit and electric power system.
Background technology
In electric power system, power supply unit and electrical equipment are generally included.Power supply unit to
During connected power supply for electrical equipment, if the load of electrical equipment is larger or electricity consumption is set
Short circuit, the then electric current that power supply unit can be caused to be exported to electrical equipment such as occur for standby break down
It is excessive, when the electric current that power supply unit is exported exceeds the design threshold of power supply unit, it is possible to make
Overheat and run into electrical equipment, and finally burn, therefore general set in power supply unit exports
Defencive function, so that cut-out power supply unit is set with electricity consumption when the electric current that power supply unit is exported is excessive
Standby connection, to reach the purpose for protecting power supply unit not to be burned out.
It is exemplary, shown in reference picture 1, the electric power system in Fig. 1 include power supply unit 11,
Electrical equipment 12, wherein when the electric current that power supply unit 11 is exported exceeds the design threshold of power supply unit
When, in power supply unit 11 in the presence of output protecting function, power supply unit 11 by itself with
The open circuit of electrical equipment 12, when the electric current that power supply unit 11 is exported is returned to less than power supply unit
During design threshold, power supply unit 11 turns on itself with electrical equipment 12, and recovery is set to electricity consumption
Standby power supply.
But in above-mentioned technical proposal, the output protecting function of power supply unit makes it in electrical equipment
Load it is larger when, with electrical equipment be in off state so that load it is higher or load become
Change larger electrical equipment when accessing power supply unit, it is impossible to obtain lasting power supply, reduce
The operating efficiency of electrical equipment, compromises Consumer's Experience.
The content of the invention
A kind of protection circuit and electric power system that embodiments of the invention are provided, can maintain to supply
On the premise of the current peak that electric equipment is exported to electrical equipment, adjustment power supply unit is to electricity consumption
The virtual value of equipment institute output current, while power supply unit is protected, is provided for electrical equipment
Continued power, improves the operating efficiency of electrical equipment, improves Consumer's Experience.
To reach above-mentioned purpose, embodiments of the invention are adopted the following technical scheme that：
In a first aspect, the embodiments of the invention provide a kind of protection circuit, be arranged at power supply unit with
In current supply circuit between electrical equipment, including:Current limliting module, control module, sampling module, are supplied
Electrical circuit includes first line and the second circuit, and first line is respectively positioned on power supply with the second circuit and set
It is standby that current limliting module is arranged in first line between electrical equipment and first line is supply line,
Sampling module is arranged in the second circuit, and control module connects respectively with current limliting module, detection module
Connect；
Sampling module, for detecting the electric current of the second circuit, and takes to control module output current
Sample value；
Control module, for according to current sampling value, to current limliting module output control information；
Current limliting module, the current duty cycle for adjusting first line according to control information, first
The current duty cycle of circuit is the ratio between ON time and turn-on cycle of first line.
In the first possible implementation of first aspect, the control module specifically for,
When current sampling value is more than the first predetermined current threshold, believe to the control of current limliting module output first
Breath；
Current limliting module is additionally operable to, and the current duty cycle of first line is reduced according to the first control information.
In second of possible implementation of first aspect, the control module specifically for,
When current sampling value is less than or equal to the first predetermined current threshold, second is exported to current limliting module
Control information；
Current limliting module is additionally operable to, and is turned on first line according to the second control information；
Or,
Control module specifically for, when current sampling value be less than the second predetermined current threshold when, to
Current limliting module exports the 3rd control information；
Current limliting module is additionally operable to, and the current duty cycle of first line is improved according to the 3rd control information.
In the third possible implementation of first aspect, sampling module includes first resistor
Unit and amplifier unit；
First resistor unit is arranged on the second circuit, the first end of first resistor unit and power supply
Equipment is connected, and the second end of first resistor unit is connected with electrical equipment；
Amplifier unit first end is connected with the first end of first resistor unit, amplifier unit
Two ends are connected with the second end of first resistor unit, the 3rd end of amplifier unit and control module
Connection；
Amplifier unit is used for according to first resistor unit first end and the end of first resistor unit second
Between voltage to control module output current sampling value.
In the 4th kind of possible implementation of first aspect, current limliting module includes first switch
Unit, second switch unit, the first end of first switch unit are connected with voltage input end, the
The control end of one switch element is connected with control module, the second end ground connection of first switch unit,
The first end of second switch unit is connected with power supply unit, the second end of second switch single unit with
Electrical equipment is connected, and the control end of second switch unit is connected with the first end of first switch unit；
First switch unit is used for when the control end of first switch unit receives control signal, the
The first end of one switch element is turned on the second end of first switch unit；
Second switch unit, for when control end and the earth terminal of second switch unit are turned on,
The first end of second switch unit and the second end open circuit of second switch unit.
The third possible implementation with reference to first aspect, in the 5th kind of possible implementation
In, amplifier unit is specifically for by first resistor unit first end and first resistor unit the
Voltage amplification preset multiple between two ends, and the voltage output after preset multiple will be amplified to control
Module.
The third possible implementation with reference to first aspect, in the 6th kind of possible implementation
In, amplifier unit also includes second resistance unit, second resistance unit first end and amplifier
The first end connection of unit, the second end of second resistance unit and the 3rd end of amplifier unit connect
Connect.
With reference to the 4th kind of possible implementation of first aspect, in the 7th kind of possible implementation
In, current limliting module also includes 3rd resistor unit, the 4th resistance unit, the 5th resistance unit,
3rd resistor unit is arranged between the control end of control module and first switch unit, the 4th resistance
Unit is arranged between the first end of voltage input end and first switch unit, and the 5th resistance unit is set
Put between the first end of first switch unit and the control end of second switch unit.
With reference to the 4th kind of possible implementation of first aspect, in the 8th kind of possible implementation
In, first switch unit is P-type transistor, and second switch unit is N-type transistor.
Second aspect, the embodiments of the invention provide a kind of electric power system, including power supply unit,
Electrical equipment and protection circuit, protection circuit are arranged between power supply unit and electrical equipment, its
Middle protection circuit is the protection electricity in first aspect and any possible implementation of first aspect
Road.
A kind of protection circuit and electric power system that embodiments of the invention are provided, are arranged at power supply and set
In the standby current supply circuit between electrical equipment, wherein current supply circuit includes first line and the second line
Road, first line is supply line, and the second line is detected by the sampling module positioned at the second circuit
The electric current on road, and to control module output current sampling value, control module is obtained power supply
Current sampling value in loop, and according to the current sampling value to current limliting module output control information,
So that current limliting module adjusts the current duty cycle of first line according to control information, basis is reached
Size of current adjustment power supply unit exports electricity to electrical equipment in predetermined period in current supply circuit
The size of amount, allows protection circuit according to the size of electric current in current supply circuit, is maintaining power supply
On the premise of the current peak that equipment is exported to electrical equipment, adjustment power supply unit is set to electricity consumption
The virtual value of standby institute output current, so as to be that electrical equipment is carried while power supply unit is protected
For continued power, the operating efficiency of electrical equipment is improved, Consumer's Experience is improved.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to reality
The accompanying drawing used required for applying in example or description of the prior art is briefly described, it should be apparent that, below
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of protection circuit in the prior art；
Fig. 2 is the schematic diagram of protection circuit provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of another protection circuit provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of protection circuit provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical side in the embodiment of the present invention
Case is clearly and completely described, it is clear that described embodiment is only the present invention one
Divide embodiment, rather than whole embodiments.Based on the embodiment in the present invention, this area is general
The every other embodiment that logical technical staff is obtained under the premise of creative work is not made,
Belong to the scope of protection of the invention.
It should be noted that the technical scheme for the ease of clearly describing the embodiment of the present invention,
In embodiments of the invention, the printed words such as " first ", " second " are employed to function and effect
Essentially identical identical entry or similar item make a distinction, it will be appreciated by those skilled in the art that " the
One ", the printed words such as " second " are not to be defined to quantity and execution order.Power supply is set
Standby can be CD playback equipments, video playback apparatus, FM equipment, navigator etc. mobile unit；
Electrical equipment can be the other equipment that is connected with mobile unit, or by interface equipment with it is vehicle-mounted
The other equipment of equipment connection, interface equipment can be COBBAIF, USB interface etc..Wherein originally
The transistor that the embodiment of invention is used for FET or other characteristic identical devices, its
In due to the manufacture craft source electrode of FET and drain electrode it is symmetrical, therefore in embodiments of the invention
The control end of each transistor is that grid, the first end of transistor are that the end of source electrode second is drain electrode,
Or the first end of transistor is that the second end of drain electrode is source electrode.Wherein p-type switching transistor is height
Pressure conducting, i.e. gate source voltage difference are transistor turns or unlatching when threshold voltage；
Wherein N-type switching transistor turns on for low pressure, i.e., gate source voltage difference is negative value and gate source voltage is poor
Absolute value when being more than threshold voltage, transistor turns or unlatching.
At present, electrical equipment is being accessed in scene of the power supply unit to obtain electric service, often
Often defencive function is set in power supply unit, to protect power supply unit not loaded because of electrical equipment
It is larger and cause damage.
Embodiments of the invention provide a kind of protection circuit 203, referring to the drawings shown in 2, the protection
Circuit 203 is arranged in the current supply circuit between power supply unit 201 and electrical equipment 202, specifically
Including：Sampling module 204, current limliting module 205, control module 206；
Current supply circuit wherein between power supply unit 201 and electrical equipment 202, including set from power supply
Standby 201 first end E1 is to the first end F1 of electrical equipment 202 first line, Yi Jicong
Second end F2 of electrical equipment 202 the second end to the second end E2 of power supply unit 201
Two circuits, wherein first line are supply line.
Specifically, the first end E1 of power supply unit 201 can to electrical equipment 202 first end
F1 output voltages or electric current, so as to sequentially pass through first end E1 and the electricity consumption of power supply unit 201
The first end F1 of equipment 202, i.e. first line are that electrical equipment 202 is powered；
The electric current that electrical equipment 202 is flowed through in current supply circuit passes sequentially through the of electrical equipment 202
Second end E2 of two end F2 and power supply unit 201, i.e., by the second circuit from electrical equipment 202
Power supply unit 201 is flowed to, wherein the second end E2 of power supply unit 201 potential is set less than electricity consumption
Standby 202 the second end F2 potential, it is preferred that the second end E2 of power supply unit is earth terminal.
Sampling module 204 is arranged in the second circuit, the first end of sampling module 204 and power supply
Second end E2 connections of equipment 201, the second end and the electrical equipment 202 of sampling module 204
Second end F2 connections, the 3rd end of sampling module 204 is connected with the first end of control module 206.
Current limliting module 205 is arranged in first line, the first end of current limliting module 205 and power supply
The first end E1 connections of equipment 201, the second end and the electrical equipment 202 of current limliting module 205
First end F1 connections, the 3rd end of current limliting module 205 is connected with the second end of control module 206.
Sampling module 204, the electric current for detecting the second circuit, and to the of control module 206
One end output current sampling value.
Control module 206, the current sampling value obtained for basis from sampling module 204, and root
According to the current sampling value to the output control information of current limliting module 205.
Specifically, control module 206 can by current sampling value with it is pre- in control module 206
If current threshold is compared, and according to comparative result to the output control information of current limliting module 205,
The preset formula that current sampling value can also be brought into control module 206 carries out computing, and root
According to operation result to the output control information of current limliting module 205.
Current limliting module 205, for according to the control information adjustment first obtained from control module 206
The current duty cycle of circuit.When wherein the current duty cycle of first line is the conducting of first line
Between the ratio between with turn-on cycle.
Wherein, current limliting module 205 makes limit according to the control information obtained from control module 206
Second end of the first end of flow module 205 and current limliting module 205 is periodically on or broken
Line state, and according to the control information, adjust first of the current limliting module 205 in predetermined period
Time and the ratio of predetermined period that end and the second end of current limliting module 205 are on, that is, adjust
The current duty cycle of whole first line, so as to reach adjustment power supply unit 201 by first line
The charge number exported to electrical equipment 202 in predetermined period, that is, adjust power supply unit 201
Export the size of electricity in predetermined period to electrical equipment 202 by first line, make guarantor
Protection circuit can according to the sampling value of electric current in current supply circuit, maintain power supply unit 201 to
On the premise of the current peak that electric equipment 202 is exported, power supply is set in the adjustment predetermined period time
Standby 201 to 202 output currents of electrical equipment virtual value.
A kind of protection circuit that embodiments of the invention are provided, is arranged at power supply unit and is set with electricity consumption
In current supply circuit between standby, wherein current supply circuit includes first line and the second circuit, First Line
Road is supply line, by detecting the electric current of the second circuit positioned at the sampling module of the second circuit,
And to control module output current sampling value, control module is obtained electric current in current supply circuit
Sampling value, and according to the current sampling value to current limliting module output control information, so that current limliting
Module adjusts the current duty cycle of first line according to control information, reaches according in current supply circuit
Size of current adjustment power supply unit exports the size of electricity to electrical equipment in predetermined period,
Allow protection circuit according to the size of electric current in current supply circuit, maintain power supply unit to electricity consumption
On the premise of the current peak that equipment is exported, adjustment power supply unit exports electricity to electrical equipment
The virtual value of stream, so that while power supply unit is protected, continued power is provided for electrical equipment,
The operating efficiency of electrical equipment is improved, Consumer's Experience is improved.
Further, the first predetermined current threshold is preset with control module 206, when control mould
When the current sampling value that block 206 is received is more than first predetermined current threshold, control module 206
The first control information is exported to current limliting module 205, makes current limliting module according to first control information
Reduce in predetermined period at the second end of the first end of current limliting module 205 and current limliting module 205
Time and the ratio of predetermined period in conducting, that is, the current duty cycle of first line is reduced, from
And when the current sampling value is more than first predetermined current threshold, in power supply unit 201 to electricity consumption
On the premise of 202 output current peak values of equipment, power supply unit 201 is reduced to electrical equipment 202
Electricity is exported in predetermined period, that is, reduces power supply unit to electrical equipment institute output current
Virtual value, so as to when electric current is excessive in current supply circuit, reduce power supply unit to electrical equipment institute
The virtual value of output current, while maintaining the current peak that power supply unit is exported to electrical equipment.
While power supply unit is protected, continued power is provided for electrical equipment.
Further, the first predetermined current threshold is preset with control module 206, when control mould
When the current sampling value that block 206 is received is less than or equal to first predetermined current threshold, mould is controlled
Block 206 exports the second control information to current limliting module 205, makes current limliting module according to second control
Information processed turns on the second end of the first end of current limliting module 205 and current limliting module 205, so that
Make current sampling value be less than first predetermined current threshold when, do not adjust power supply unit 201 to
Electric equipment 202 exports electricity in predetermined period, i.e., do not adjust power supply unit to electrical equipment
The virtual value of institute's output current, so that in the case of size of current is normal in current supply circuit, dimension
Hold current supply circuit normal work.While power supply unit is protected, when electric current is big in current supply circuit
When small normal, current supply circuit normal work is maintained.
Further, the second predetermined current threshold is preset with control module 206, when control mould
During small second predetermined current threshold of current sampling value that block 206 is received, control module 206 to
Current limliting module 205 exports the 3rd control information, current limliting module is carried according to first control information
Height second end of the first end of current limliting module 205 and current limliting module 205 in predetermined period is in
The time of conducting and the ratio of predetermined period, that is, improve the current duty cycle of first line, so that
When making current sampling value less than second predetermined current threshold, set in power supply unit 201 to electricity consumption
On the premise of standby 202 output current peak values, power supply unit 201 is improved to electrical equipment 202
Electricity is exported in predetermined period, that is, improves power supply unit to electrical equipment institute output current
Virtual value, so as to when electric current is too small in current supply circuit, improve power supply unit to electrical equipment institute
The virtual value of output current, while maintaining the current peak that power supply unit is exported to electrical equipment.
The continued power for meeting its demand is provided for electrical equipment.
It should be noted that default first current threshold, the second current threshold can be solid for one
Fixed current value, can also be the current range fluctuated within the specific limits.Exemplary,
Electric current less than or equal to the first current threshold can be to be made and protection electricity by what power supply unit was exported
The current range of power supply unit normal work of the road in same loop；More than the first current threshold
The electric current of value can be to be likely to result in by what power supply unit was exported with protection circuit in same loop
In power supply unit overload, element loss, the current range overheat, burn etc.；More than second
The electric current of current threshold can be likely to result in and protection electricity for the peak point current exported by power supply unit
Power supply unit overload of the road in same loop, element loss, the electric current overheat, burn etc.
Scope.
Further, referring to the drawings shown in 3, sampling module 204 includes：First resistor unit
R1, wherein amplifier unit 214, first resistor unit R 1 are arranged on the second circuit, and first
Resistance unit R1 first end is connected with the end E2 of power supply unit 201 the secondth, first resistor list
First R1 the second end and the second end F2 connections of electrical equipment；The first of amplifier unit 214
End is connected with the first end of first resistor unit R 1, the second end and first of amplifier unit 214
The of resistance unit R1 the second end connection, the 3rd end of amplifier unit 214 and control module
One end is connected.
Wherein amplifier unit 214 is used for first end and the first electricity for obtaining first resistor unit R 1
The voltage between the second end of unit R 1 is hindered, due to working as to go out by the electric current of first resistor unit R 1
When now changing, between the first end of first resistor unit R 1 and the second end of first resistor unit R 1
Voltage also occur corresponding change, therefore amplifier unit 214 according to the voltage to control
The first end output current sampling value of module 206.
Optionally, amplifier unit 214 specifically for, by the first end of first resistor unit R 1 with
Voltage amplification preset multiple between the end of first resistor unit R 1 second, and will amplify after preset multiple
Voltage exported as current sampling value to the control module so that in first resistor unit R 1
When voltage between first end and the end of first resistor unit R 1 second is too small, amplified according to preset multiple
The voltage is so as to avoid causing the None- identified of control module 206 because the voltage is too small.
It is preferred that, the preset multiple of amplifier unit 214 is 100 times.
Optionally, referring to the drawings shown in 3, sampling module 204 also includes：Second resistance unit
R2, the wherein first end of second resistance unit R 2 are connected with the first end of amplifier unit 214,
Second end of second resistance unit R 2 and the three-terminal link of amplifier unit 214.
Wherein when the electricity between the first end of first resistor unit R 1 and the end of first resistor unit R 1 second
Hour is pressed through, when the voltage, which goes out, to drift about, it is possible to the 3rd of amplifier unit 214 can be caused
The current sampling value polarity of end output changes, and makes the None- identified of control module 206, therefore
Make the 3rd end of amplifier unit 214 by second resistance unit R 2 to amplifier unit 214
First end exports positive feedback signal, so that in the first end of first resistor unit R 1 and first resistor list
When voltage between first ends of R1 second drifts about, the three-polar output of stabilizing amplifier unit 214
Current sampling value.
Further, referring to the drawings shown in 3, current limliting module 205 include first switch unit 215,
Second switch unit 225, first end and the voltage input end VDD of the first switch unit 215
Connection, the second end of the control end of the first switch unit 215 and the control module 206
Connection, the second end ground connection GND of the first switch unit 215；Second switch unit 225
The first end E1 connections of first end and power supply unit, the second end of second switch single unit 225 with
The first end F1 connections of electrical equipment, control end and the first switch list of second switch unit 225
The first end connection of member 215.
When the control end of first switch unit 214 does not receive control signal, first switch unit
215 first end and the second end open circuit of first switch unit 215, i.e. voltage input end VDD with
Open circuit between GND is grounded, between the control end and voltage input end VDD of second switch unit 225
Conducting, VDD makes second switch list to the control end input voltage signal of second switch unit 225
Second end of first end and the second switch unit 225 of member 225 is turned on, so that by first line
Conducting, makes current limliting module when not receiving the control signal of the output of control module 206, by first
Line conduction.
When the control end of first switch unit 214 receives control signal, first switch unit 215
The second end of first end and first switch unit 215 turn on, i.e. voltage input end VDD is with connecing
Turn on, turned between the control end and earth terminal GND of second switch unit 225 between ground GND,
The non-input voltage signal of control end of second switch unit 225, makes second switch unit 225
First end and the second end open circuit of second switch unit 225, so as to by first line open circuit, make
Current limliting module is when receiving the control signal of the output of control module 206, by first line open circuit.
Optionally, referring to the drawings shown in 3, current limliting module 205 also include 3rd resistor unit R 3,
4th resistance unit R4, the 5th resistance unit R4, wherein 3rd resistor unit R 3 are arranged on control
Between second end of molding block 206 and the control end of first switch unit 215, the 4th resistance unit
R4 is arranged between the first end of voltage input end VDD and first switch unit 215, the 5th resistance
Unit is arranged on the first end of first switch unit 215 and the control end of second switch unit 225
Between.
Wherein 3rd resistor unit R 3 increases the second end and the first switch unit of control module 206
Resistance value between 215 control end, so that at the second end of control module 206 to first switch list
Protection first switch unit 215 is without damage when the control end of member 215 exports excessive voltage.
4th resistance unit R4 increases between the first end of voltage input end VDD and first switch unit 215
Resistance value so that first end from voltage input end VDD to first switch unit 215 export
Protection first switch unit 215 is without damage during excessive voltage.5th resistance unit R5 increases
The resistance value of the first end of first switch unit 215 and the control end of second switch unit 225,
From protecting the when voltage VDD exports excessive voltage to the second end of second switch unit 225
Two switch elements 225 are without damage.
Specifically, described in reference picture 4, amplifier unit 214 can be amplifier A1, control
Module 206 can be processor CPU, and first resistor unit R 1 can be resistance R101, second
Resistance unit R2 can be resistance R201, and first switch unit 215 can be P-type transistor
Q1, second switch unit can be N-channel Metal-Oxide Semiconductor field-effect transistor (English
Literary full name：Metal-Oxide-Semiconductor Field-Effect Transistor, letter
Claim：MOSFET) Q2,3rd resistor unit R 3 can be resistance R301, the 4th resistance unit
R4 can be able to be resistance R501 for resistance R401, the 5th resistance unit R5.
Wherein resistance R101 first end is connected with power supply unit 201, and the second of resistance R101
End is connected with electrical equipment 202, and amplifier A1 normal phase input end and R101 first end connect
Connect, amplifier A1 input anyway and R101 the second end are connected, amplifier A1 output
End is connected with processor CPU first end, and resistance R201 first end and amplifier A1 are just
Connected to input, resistance R201 the second end is connected with amplifier A1 output end, resistance
R301 one end is connected with processor CPU the second end, the resistance R301 other ends and P-type transistor
Q1 control pole connection, resistance R401 one end is connected with voltage input end VDD, resistance R401
The other end is connected with P-type transistor Q1 first end, P-type transistor Q1 the second end ground connection
GND, resistance R501 one end is connected with P-type transistor Q1 first end, and resistance R501 is another
End is connected with N-type MOSEFT Q2 control end, and N-type MOSEFT Q2 first end is set with electricity consumption
Standby 202 first end F1 connections, N-type MOSEFT Q2 the second end and power supply unit 201
First end E1 connections.
The operation principle for the protection circuit that above-described embodiment is provided is as follows, wherein flowing through resistance R101
Electric current be I1, then the voltage at resistance R101 two ends is carried in, that is, is being carried in amplifier A1 just
It is V to the voltage between input and amplifier A1 inverting input1=R101*I1, amplifier A1
After voltage amplification preset multiple N, to processor CPU first end output current sampling value
VI=N*V1, processor CPU receiving current sampling value VIAfterwards, by VIWith in processor CPU
Predetermined threshold value VADIt is compared, works as V1<VADWhen, processor CPU the second end output low level,
The low level is less than P-type transistor Q1 cut-in voltage, and P-type transistor Q1 base stage is low electricity
Gesture, the open circuit of P-type transistor Q1 first end and the second end, therefore with P-type transistor Q1 first
The N-type held the voltage input end VDD of connection and be connected with P-type transistor Q1 first ends
MOSEFT Q2 control end conducting, control end from voltage input end VDD to N-type MOSEFT Q2
Output is higher than the voltage signal of N-type MOSEFT Q2 cut-in voltages, therefore N-type MOSEFT Q2
First end and the second end turn on；Work as V1>VADWhen, processor CPU the second end can also be exported
High level, the high level is higher than P-type transistor Q1 cut-in voltage, P-type transistor Q1 base
Extremely high potential, P-type transistor Q1 first end is turned on the second end, due to P-type transistor
Q1 the second end ground connection GND, therefore the voltage input end being connected with P-type transistor Q1 first ends
VDD is grounded GND, the control for the N-type MOSEFT Q2 being connected with P-type transistor Q1 first ends
End is also grounded GND, is low potential, therefore N-type MOSEFT Q2 first end and the second end are breaking,
Processor CPU is according to VIWith VADPeriodically to processor CPU the second end output high frequency switching
High level and low level signal, make N-type MOSEFT Q2 first end and N-type MOSEFT Q2
Time for being turned in predetermined period of the second end it is shorter and shorter, so as to reduce confession in the unit interval
The electricity that electric equipment is exported to electrical equipment, so that when electric current is excessive in current supply circuit, drop
Virtual value from low power supply unit to electrical equipment institute output current, while maintain power supply unit to
The current peak that electric equipment is exported.While power supply unit is protected, provided for electrical equipment
Continued power.
Optionally, processor CPU is specifically for according to VIWith VADAdjust the second ends of processor CPU
Exported high level time ratios shared in predetermined period, it is preferred that work as VIWith VADThe ratio between
During increase, the ends of processor CPU second export high level time ratio shared in predetermined period
Value also increases therewith.Exemplary, the ends of processor CPU second export high level in default week
The shared time is T in phaseG, predetermined period is that default proportionality constant is in T, processor CPU
N, processor is obtained according to following formula and according to TGExport high level.
It should be noted that above mentioned embodiment provide first resistor unit R 1 including resistance R101,
Second resistance unit R 2, which includes resistance R201,3rd resistor unit R 3, includes resistance R301, the
Four resistance unit R4, which include resistance R401, the 5th resistance unit R5, includes resistance R501 scheme
A kind of only implementation of the embodiment of the present invention, and can not be as to the embodiment of the present invention
Limit, resistance unit can also include the parallel branch of one or more, every branch road can also be by
More than one resistance composition.
, wherein it is desired to which the unit in explanation, the present embodiment can individually be set up
Processor, sensor or electronic component, can also be integrated in some processor, sensor or
Realized in electronic component, in addition it is also possible to be stored in touch point identification in the form of program code
In the memory of device, the function of above unit is called by processor and performed.Here institute
The processor stated can be a central processing unit (English full name：Central Processing
Unit, English abbreviation：CPU), or be arranged to implement one of the embodiment of the present invention or
Multiple integrated circuit (English full name：Integrated Circuit, English abbreviation：IC).
Specifically, embodiments of the invention provide a kind of electric power system, including power supply unit, use
Electric equipment and protection circuit, protection circuit are arranged between power supply unit and electrical equipment, wherein
The protection circuit that protection circuit provides for any of the above-described embodiment.
A kind of electric power system that embodiments of the invention are provided, can be according to electric current in current supply circuit
Size adjust supply line current duty cycle, reach and adjusted according to size of current in current supply circuit
Whole power supply unit exports the size of electricity to electrical equipment in predetermined period, is maintaining power supply
On the premise of the current peak that equipment is exported to electrical equipment, adjustment power supply unit is set to electricity consumption
The virtual value of standby institute output current, so as to be that electrical equipment is carried while power supply unit is protected
For continued power, the operating efficiency of electrical equipment is improved, Consumer's Experience is improved.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is simultaneously
Be not limited to this, any one skilled in the art the invention discloses technology model
In enclosing, the change or replacement that can be readily occurred in should be all included within the scope of the present invention.
Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. a kind of protection circuit, is arranged in the current supply circuit between power supply unit and electrical equipment,
It is characterised in that it includes:Current limliting module, control module, sampling module, the current supply circuit bag
First line and the second circuit are included, the first line is respectively positioned on the confession with second circuit
Between electric equipment and the electrical equipment and the first line be supply line, the current limliting module
It is arranged in the first line, the sampling module is arranged in second circuit, described
Control module is connected respectively with the current limliting module, the detection module；
The sampling module, the electric current for detecting second circuit, and to the control mould
Block output current sampling value；
The control module, for according to the current sampling value, being exported to the current limliting module
Control information；
The current limliting module, the electric current duty for adjusting first line according to the control information
Than the current duty cycle of the first line is that the ON time of the first line and conducting are all
The ratio between phase.
2. protection circuit according to claim 1, it is characterised in that the control module
Specifically for when the current sampling value is more than the first predetermined current threshold, to the current limliting
Module exports the first control information；
The current limliting module is additionally operable to, and the first line is reduced according to first control information
Current duty cycle.
3. protection circuit according to claim 1, it is characterised in that the control module
Specifically for when the current sampling value is less than or equal to the first predetermined current threshold, to institute
State current limliting module and export the second control information；
The current limliting module is additionally operable to, and is led the first line according to second control information
It is logical；
Or,
The control module is specifically for when the current sampling value is less than the second predetermined current threshold
During value, the 3rd control information is exported to the current limliting module；
The current limliting module is additionally operable to, and the first line is improved according to the 3rd control information
Current duty cycle.
4. protection circuit according to claim 1, it is characterised in that the sampling module
Including first resistor unit and amplifier unit；
The first resistor unit is arranged on second circuit, the first resistor unit
First end is connected with the power supply unit, the second end and the electricity consumption of the first resistor unit
Equipment is connected；
The amplifier unit first end is connected with the first end of the first resistor unit, described
The end of amplifier unit second is connected with the second end of the first resistor unit, the amplifier list
3rd end of member is connected with the control module；
The amplifier unit is used for according to the first resistor unit first end and the described first electricity
Voltage between unit second end is hindered to the control module output current sampling value.
5. protection circuit according to claim 1, it is characterised in that the current limliting module
Including first switch unit, second switch unit, first end and the electricity of the first switch unit
Input connection is pressed, the control end of the first switch unit is connected with the control module, institute
The second end ground connection of first switch unit is stated, the first end of the second switch unit is supplied with described
Electric equipment is connected, and the second end of the second switch single unit is connected with the electrical equipment, institute
The control end for stating second switch unit is connected with the first end of the first switch unit；
The first switch unit is used for when the control end of the first switch unit receives the control
During signal processed, the first end of the first switch unit and the second end of the first switch unit
Conducting；
The second switch unit, for being connect when the control end of the second switch unit with described
When ground terminal is turned on, the first end of the second switch unit and the second of the second switch unit
End open circuit.
6. protection circuit according to claim 4, it is characterised in that the amplifier list
Member is specifically for by the first resistor unit first end and the end of first resistor unit second
Between voltage amplification preset multiple, and the voltage output after preset multiple will be amplified to the control
Module.
7. protection circuit according to claim 4, it is characterised in that the amplifier list
Member also includes second resistance unit, the second resistance unit first end and the amplifier unit
First end connection, the second end of the second resistance unit and the 3rd of the amplifier unit the
End connection.
8. protection circuit according to claim 5, it is characterised in that the current limliting module
Also include 3rd resistor unit, the 4th resistance unit, the 5th resistance unit, the 3rd resistor
Unit is arranged between the control end of the control module and the first switch unit, and the described 4th
Resistance unit is arranged between the first end of the voltage input end and the first switch unit, institute
State first end and the second switch list that the 5th resistance unit is arranged on the first switch unit
Between the control end of member.
9. protection circuit according to claim 5, it is characterised in that the first switch
Unit is P-type transistor, and the second switch unit is N-type transistor.
10. a kind of electric power system, it is characterised in that including power supply unit, electrical equipment and guarantor
Protection circuit, the protection circuit is arranged between the power supply unit and the electrical equipment, its
Described in protection circuit be claim any one of 1-9 described in protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610115319.8A CN107147284A (en) | 2016-03-01 | 2016-03-01 | A kind of protection circuit and electric power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610115319.8A CN107147284A (en) | 2016-03-01 | 2016-03-01 | A kind of protection circuit and electric power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107147284A true CN107147284A (en) | 2017-09-08 |
Family
ID=59783960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610115319.8A Pending CN107147284A (en) | 2016-03-01 | 2016-03-01 | A kind of protection circuit and electric power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107147284A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768524A (en) * | 2018-12-18 | 2019-05-17 | 深圳市优必选科技有限公司 | A kind of current protecting circuit and current protection method for high-pressure system |
| CN111007310A (en) * | 2019-12-26 | 2020-04-14 | 上海贝岭股份有限公司 | Intelligent Internet of things chip and current detection circuit thereof |
| WO2021027768A1 (en) * | 2019-08-14 | 2021-02-18 | 上海爻火微电子有限公司 | Current measurement circuit for power channel, and electronic device |
-
2016
- 2016-03-01 CN CN201610115319.8A patent/CN107147284A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768524A (en) * | 2018-12-18 | 2019-05-17 | 深圳市优必选科技有限公司 | A kind of current protecting circuit and current protection method for high-pressure system |
| WO2021027768A1 (en) * | 2019-08-14 | 2021-02-18 | 上海爻火微电子有限公司 | Current measurement circuit for power channel, and electronic device |
| CN111007310A (en) * | 2019-12-26 | 2020-04-14 | 上海贝岭股份有限公司 | Intelligent Internet of things chip and current detection circuit thereof |
| CN111007310B (en) * | 2019-12-26 | 2022-06-21 | 上海贝岭股份有限公司 | Intelligent Internet of things chip and current detection circuit thereof |
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Application publication date: 20170908 |