CN109327131A - A kind of current limiting switch circuit and switching power unit - Google Patents
A kind of current limiting switch circuit and switching power unit Download PDFInfo
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- CN109327131A CN109327131A CN201811146621.5A CN201811146621A CN109327131A CN 109327131 A CN109327131 A CN 109327131A CN 201811146621 A CN201811146621 A CN 201811146621A CN 109327131 A CN109327131 A CN 109327131A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The present invention relates to a kind of current limiting switch circuit and switching power units, the current limiting switch circuit includes: voltage control module, the first input end of the voltage control module receives association voltage, second input terminal of the voltage control module receives reference voltage, the voltage control module generates charging control signal according to the association voltage and reference voltage, and the charging control signal is exported via the output end of the voltage control module；Switch module, the input terminal of the switch module receives the input current of the Input voltage terminal, and determines whether that the output voltage terminal charges according to the charging control signal；Compensating module, suitable for generating compensation electric current according to the input current of the Input voltage terminal, the compensation electric current is used to provide compensation to the output voltage terminal.Technical solution of the present invention can be with effective compensation because of voltage drop caused by line loss, cable impedance, contact impedance etc..
Description
Technical field
The present invention relates to electronic circuit technology field more particularly to a kind of current limiting switch circuits and switching power unit.
Background technique
With the development that science and technology is with rapid changepl. never-ending changes and improvements, the function of electronic equipment is stronger and stronger, for used power supply
Higher requirements are also raised.Under normal conditions, the supply voltage of power supply can not exactly match electronic equipment and work normally institute
Required voltage, therefore just need to carry out supply voltage using voltage conversion device (such as: Switching Power Supply, voltage regulator circuit etc.)
The electronic equipment is available to after conversion.
In order to charge simultaneously to multiple electronic equipments, it is typically employed in the output of voltage conversion device in the prior art
It holds external a plurality of charging paths, when concrete application, the external multiple USB of the delivery outlet in voltage conversion device can be passed through
(Universal Serial Bus) interface simultaneously charges to multiple electronic equipments with realizing.In order to make up USB interface to electronics
Line loss, cable impedance, contact impedance between equipment etc. and caused by voltage drop, generally use improve USB interface at
The mode of voltage, to guarantee electronic equipment charge rate with higher.
By every branch input terminal received voltage both be from the output end of the same voltage conversion device.If
Voltage compensation is carried out for certain band load branch, the output voltage of remaining unloaded branch can also follow rising, cause unloaded branch
Output voltage be more than specification, not only result in the waste of electric energy, also will affect the service life of voltage conversion device.
How providing one kind can be a problem to be solved with the current limiting switch circuit of accurate compensation line loss.
Summary of the invention
Present invention solves the technical problem that be how to provide it is a kind of can be with the current limiting switch circuit of accurate compensation line loss.
In order to solve the above technical problems, there is Input voltage terminal the embodiment of the invention provides a kind of current limiting switch circuit
And output voltage terminal, the current limiting switch circuit includes: voltage control module, and the first input end of the voltage control module connects
Association voltage is received, the second input terminal of the voltage control module receives reference voltage, and the voltage control module is according to
Be associated with voltage and reference voltage and generate charging control signal, the charging control signal via the voltage control module output
End output, wherein the association voltage changes with the variation of the voltage of output voltage terminal；Switch module, the switch module
Input terminal receive the input current of the Input voltage terminal, and the output is determined whether according to the charging control signal
Voltage end charging；Compensating module, suitable for generating compensation electric current, the compensation according to the input current of the Input voltage terminal
Electric current is used to provide compensation to the output voltage terminal.
Optionally, the current limiting switch circuit further include: sampling module, suitable for receiving the input electricity of the Input voltage terminal
Stream, and control voltage is converted by the input current, the control voltage is used to control the described of the compensating module generation
Compensate the size of electric current.
Optionally, the compensating module includes: the first current source, and the input terminal of first current source connects power supply, institute
The control terminal for stating the first current source receives the control voltage；First resistor, the first end connection described the of the first resistor
The output end of one current source, the second end ground connection of the first resistor；The control terminal of second current source, second current source connects
The output end of first current source, the output end ground connection of second current source are connect, the input terminal of second current source is
The output end of the compensating module.
Optionally, when the electric current of the Input voltage terminal increases, the received control of control terminal of first current source
Voltage increases, and the first electric current that first current source generates increases, and the voltage of the first end of first resistor increases, and described second
The second electric current that current source generates increases, and second electric current provides compensation to the output voltage terminal, so that the output is electric
The output voltage of pressure side increases.
Optionally, the current limiting switch circuit further include: division module, the division module are suitable for receiving the output electricity
The voltage of pressure side, and generate the association voltage.
Optionally, the division module includes: second resistance, and the first end of the second resistance connects the output voltage
End；3rd resistor, the first end of the 3rd resistor connect the second end of the second resistance, the second end of the 3rd resistor
Ground connection, wherein the first end of the 3rd resistor is the output end of the division module.
Optionally, the switch module includes: field effect transistor, and the source electrode of the field effect transistor receives described defeated
Enter electric current, the drain electrode of the field effect transistor connects the output voltage terminal, and the grid of the field effect transistor receives institute
State charging control signal.
Optionally, in circuit initial launch, the association voltage is less than the reference voltage, the charging control signal
It is open-minded to control the field effect transistor, charges for the output voltage terminal；With the raising of the output voltage of output voltage terminal,
Voltage difference between the association voltage and reference voltage reduces, the voltage difference between the association voltage and reference voltage
After value is decreased to 0, the association voltage is equal to the reference voltage, and the output voltage of the output voltage terminal reaches stable shape
State.
Optionally, the voltage control module includes: operational amplifier, and the first input end of the operational amplifier receives
Second input terminal of the reference voltage, the operational amplifier receives the association voltage, the output of the operational amplifier
End generates the charging control signal.
Optionally, the current limiting switch circuit further includes the 4th resistance, is filled described in the first end reception of the 4th resistance
The second end of electric control signal, the 4th resistance connects the control terminal of the switch module.
Optionally, the current limiting switch circuit further include: over-current detection circuit, the over-current detection circuit are suitable for receiving pre-
If the input current of electric current and the Input voltage terminal, and according to the comparison result of the input current and predetermined current
Generated flow control signals；Flow control switch is crossed, the input terminal for crossing flow control switch connects the input of the switch module
End, the output end for crossing flow control switch connect the control terminal of the switch module, the control terminal for crossing flow control switch
The flow control signals excessively are received, it is described to cross flow control switch on or off under the control for crossing flow control signals.
In order to solve the above technical problems, the embodiment of the invention also provides a kind of switching power unit, including Switching Power Supply,
It further include current limiting switch circuit above-mentioned.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
The current limiting switch circuit of technical solution of the present invention includes voltage control module, switch module and compensating module, institute
The first input end for stating voltage control module receives association voltage, and the second input terminal of the voltage control module is received with reference to electricity
Pressure, the voltage control module generate charging control signal, the charge control letter according to the association voltage and reference voltage
Number via the voltage control module output end export, wherein it is described association voltage with the voltage of output voltage terminal variation
And change；The input terminal of the switch module receives the input current of the Input voltage terminal, and is believed according to the charge control
Number determine whether the output voltage terminal charging；The compensating module is suitable for the input electricity according to the Input voltage terminal
Stream generates compensation electric current, and the compensation electric current is used to provide compensation to the output voltage terminal.Thus, it is possible to which effective compensation is because of line
Voltage drop caused by path loss consumption, improves the charge rate of load.Furthermore it is also possible to the output voltage terminal of current limiting switch circuit
Voltage controlled, avoid idle voltage output be more than specification.
Further, the compensating module in technical solution of the present invention includes: the first current source, first resistor and the second electric current
Source, the input terminal of first current source connect power supply, and the control terminal of first current source receives the control voltage；It is described
The first end of first resistor connects the output end of first current source, the second end ground connection of the first resistor；Described second
The control terminal of current source connects the output end of first current source, and the output end of second current source is grounded, and described second
The input terminal of current source is the output end of the compensating module.The cooperation for only passing through controllable current source and resistance as a result, can
Realization compensates output voltage terminal, is effectively simplified circuit structure, optimizes circuit cost.
Further, the switch module of technical solution of the present invention includes field effect transistor, the source of the field effect transistor
Pole receives the input current, and the drain electrode of the field effect transistor connects the output voltage terminal, the field effect transistor
Grid receive the charging control signal.Since the temperature stability and capability of resistance to radiation of field effect transistor are stronger, because
This, the switch module using field effect transistor as circuit can effectively improve the voltage stability of output voltage terminal.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of current limiting switch circuit in the prior art；
Fig. 2 is the structural schematic diagram of another current limiting switch circuit in the prior art；
Fig. 3 is a kind of structural schematic diagram of current limiting switch circuit of the embodiment of the present invention；
Fig. 4 is a kind of schematic diagram of concrete application scene of the embodiment of the present invention.
Specific embodiment
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to existing
There are technology and specific embodiments of the present invention to be described in detail.Obviously, described embodiment is only the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
Every other embodiment obtained, belongs to protection scope of the present invention under the premise of creative work.
Fig. 1 is a kind of structural schematic diagram of current limiting switch circuit in the prior art.
Referring to FIG. 1, the current limiting switch circuit have input terminal IN and multiple output end OUT1, OUT2 ...
OUTn, the input terminal IN are connect with the output end of voltage conversion device 1, and the voltage conversion device 1 can be Switching Power Supply
Or DC-DC voltage transformation or AC-DC voltage transformation may be implemented in voltage regulator circuit, the voltage conversion device 1, and will
For transformed direct voltage output to the current limiting switch circuit, every exports current limiting switch K1, the current limiting switch of branch road
K2 ... current limiting switch Kn can only limit the size of output electric current, and do not have adjust multiple output end OUT1, OUT2 ...
The function of the output voltage of OUTn.In practical applications, it in order to avoid the floating voltage of several unloaded branches is more than specification, then needs
The voltage of the input terminal IN of current limiting switch circuit is limited, this voltage for resulting in bringing onto load branch is limited, and load is affected
The rate of charging.
Fig. 2 is the structural schematic diagram of another current limiting switch circuit in the prior art.
Referring to FIG. 2, the current limiting switch circuit have input terminal IN and multiple output end OUT1, OUT2 ...
OUTn, the input terminal IN are connect with the output end of voltage conversion device 1, and the voltage conversion device 1 can be Switching Power Supply
Or DC-DC voltage transformation or AC-DC voltage transformation may be implemented in voltage regulator circuit, the voltage conversion device 1, and will
For transformed direct voltage output to the current limiting switch circuit, every output branch road is disposed with first resistor R1, the
Two resistance R2 ..., N resistance Rn, current sampling module 2 flow through the electric current of every branch by acquisition, are turned by adjusting voltage
The voltage of the control terminal FB of changing device 1, and then adjust the voltage of the input terminal IN of current limiting switch circuit.When it is implemented, when control
When the voltage of end FB processed increases, due to the voltage between the voltage of the input terminal IN of the voltage and current limiting switch circuit of control terminal FB
Difference is constant, and therefore, the voltage of the input terminal IN of the current limiting switch circuit increases.However, in the current limiting switch electricity
The voltage of Lu Zhong, input terminal IN caused by any branch increase, and necessarily will also result in the liter of the input voltage of other branches
Height, and then the output voltage that may cause wherein unloaded branch is more than specification.
Current limiting switch circuit matching by voltage control module, switch module and compensating module in the embodiment of the present invention
It closes, can guarantee efficient for load charging with effective compensation because of voltage drop caused by line loss.Furthermore it is also possible to right
The voltage of the output voltage terminal of current limiting switch circuit is controlled, and avoiding idle voltage output is more than specification.
Fig. 3 is a kind of structural schematic diagram of current limiting switch circuit of the embodiment of the present invention.
In the present embodiment, the current limiting switch circuit can be IC chip, be also possible to by various discrete devices
The board-level circuit of composition.The current limiting switch circuit can be used for being connected between voltage conversion device and load, can also make
It is used for the sub-circuit for playing metering function in integrated circuit.
Specifically, the voltage conversion device can be Switching Power Supply, voltage regulator circuit etc., and the voltage conversion device can be with
The transformation of realization DC-DC voltage (such as: the voltage transformation of 40V high voltage direct current -5V low-voltage direct) or the change of AC-DC voltage
Change (such as: the voltage transformation of 220V high-voltage alternating -5.5V low-voltage direct).
Referring to FIG. 3, there is the current limiting switch circuit Input voltage terminal IN and output voltage terminal OUT, the current limliting to open
Powered-down road may include: voltage control module 4, and the first input end of the voltage control module 4 receives association voltage VB, described
Second input terminal of voltage control module 4 receives reference voltage VREF, and the voltage control module 4 is according to the association voltage VB
Charging control signal VC is generated with reference voltage VREF, the charging control signal VC is defeated via the voltage control module 4
Outlet output, wherein the association voltage VB changes with the variation of the voltage of output voltage terminal OUT；Switch module 2, it is described
The input terminal of switch module 2 receives the input current of the Input voltage terminal IN, and is determined according to the charging control signal VC
Whether charge to the output voltage terminal OUT；Compensating module 3, suitable for the input current according to the Input voltage terminal IN
Compensation electric current is generated, the compensation electric current is used to provide compensation to the output voltage terminal OUT.
Specifically, the Input voltage terminal IN can connect the output end of voltage conversion device, and receive straight after conversion
Galvanic electricity pressure；The output voltage terminal OUT can be USB port, and the output voltage terminal OUT is for connecting load, the load
It can be various electronic equipments.
In a non-limiting embodiment, the compensating module 3 can directly receive the Input voltage terminal IN's
Input current, the input current are used to control the size for the compensation electric current that the compensating module 3 generates.
In another non-limiting embodiment, the compensating module 3 can receive control voltage, the control voltage
It converts to obtain by the input current, the size for the compensation electric current that the compensating module 3 generates is controlled by the control voltage.It
Afterwards, the application will carry out detailed so that the compensating module 3 controls compensation electric current according to the size of the control voltage as an example
Explanation.
Further, the current limiting switch circuit can also include: sampling module 1, be suitable for receiving the Input voltage terminal
The input current of IN, and control voltage is converted by the input current.
Further, the sampling module 1 may include sampling resistor Rsense and current detecting and conversion circuit 11,
The current detecting and conversion circuit 11 can acquire the input current for flowing through sampling resistor Rsense, and by the input
Electric current is converted into the control voltage.
Further, since the current value of the input current is smaller, the current detecting and conversion circuit 11 can be with
The input current is subjected to voltage conversion and Linear Amplifer, the voltage after the Linear Amplifer is supplied to institute as control voltage
State compensating module 3.
It should be noted that it is described by input current be converted into control voltage current detecting and conversion circuit 11 can adopt
With current-voltage conversion circuit in the prior art, the embodiment of the present invention is without limitation.
Further, the compensating module 3 may include: the first current source I1, the input terminal of the first current source I1
Power supply VCC is connected, the control terminal of the first current source I1 receives the control voltage；First resistor R1, the first resistor
The first end of R1 connects the output end of the first current source I1, the second end ground connection of the first resistor R1；Second current source
I2, the control terminal of the second current source I2 connect the output end of the first current source I1, and the second current source I2's is defeated
Outlet ground connection, the input terminal of the second current source I2 are the output end of the compensating module 3.
Further, the power supply VCC can be the power supply or the power supply VCC of current limiting switch circuit external
It can integrate in the current limiting switch circuit.Specifically, the power supply VCC can be DC power supply, and the power supply VCC
Voltage value can be fixed value or adjustable value, to adapt to the power demands to different occasions.
In addition, in order to save circuit area, the input terminal of the first current source I1 also can connect the input voltage
IN is held, is the first current source I1 power supply by the DC voltage of the Input voltage terminal IN.
Specifically, the first resistor R1 can be fixed resistance value or the resistance of resistance value changeable terminals, to adapt to unused application
The needs of occasion.
Further, the first resistor R1 can be by multiple sub- resistor coupled in parallel or series connection and obtain.
Further, the current limiting switch circuit can also include: division module 5, and the division module 5 is suitable for receiving institute
The voltage of output voltage terminal OUT is stated, and generates the association voltage VB.
Further, the division module 5 may include: second resistance R2, the first end connection of the second resistance R2
The output voltage terminal OUT；3rd resistor R3, the first end of the 3rd resistor R3 connect the second of the second resistance R2
End, the second end ground connection of the 3rd resistor R3, wherein the first end of the 3rd resistor R3 is the defeated of the division module 5
Outlet.
When it is implemented, the resistance value of the second resistance R2 and the resistance value of 3rd resistor R3 can be the same or different；
The second resistance R2 and/or 3rd resistor R3 can be fixed resistance value or the resistance of resistance value changeable terminals, to adapt to unused application
The needs of occasion.
Further, the second resistance R2 and/or 3rd resistor R3 can be by multiple sub- resistor coupled in parallel or series connection and
It obtains.
Further, the switch module 2 may include: field effect transistor P, the source electrode of the field effect transistor P
The input current is received, the drain electrode of the field effect transistor P connects the output voltage terminal OUT, the field effect transistor
The grid of pipe P receives the charging control signal VC.
When it is implemented, the field effect transistor P can be p type field effect transistor.
As a change case, the field effect transistor P can also be n type field effect transistor, in this alternative,
The drain electrode of the field effect transistor P receives the input current, and the source electrode of the field effect transistor P connects the output electricity
The grid of pressure side OUT, the field effect transistor P receive the charging control signal VC.
It is understood that those skilled in the art can be according to different applications come the selection field-effect of adaptability
The concrete type of transistor P, the embodiment of the present invention are without limitation.
Further, the voltage control module 4 may include: operational amplifier, and the first of the operational amplifier is defeated
Enter end and receive the reference voltage VREF, the second input terminal of the operational amplifier receives the association voltage VB, the fortune
The output end for calculating amplifier generates the charging control signal VC.
Specifically, the first input end of the operational amplifier is negative input end, the second input of the operational amplifier
End is positive input terminal.The size of the charging control signal VC is the reference voltage VREF and the voltage difference for being associated with voltage VB
The product of value and op-amp gain.
Impact of the overcurrent to component and load in circuit in order to prevent, further, the current limiting switch electricity
Road can also include: over-current detection circuit 6, and the over-current detection circuit 6 is suitable for receiving predetermined current and the input voltage
The input current of IN is held, and flow control signals SW was generated according to the comparison result of the input current and predetermined current；
Flow control switch S is crossed, the input terminal for crossing flow control switch S connects the input terminal of the switch module 2, described to cross flow control
The output end of switch S connects the control terminal of the switch module 2, and the control terminal for crossing flow control switch S receives the overcurrent
Signal SW is controlled, it is described to cross flow control switch S on or off under the control for crossing flow control signals SW.
Specifically, the source electrode crossed flow control switch S input terminal and connect the field effect transistor P, it is described to cross flow control
The output end of system switch S connects the grid of the field effect transistor P, described in the control terminal reception for crossing flow control switch S
Cross flow control signals SW.
After the closure of flow control switch S excessively, the source electrode and grid of the field effect transistor P links together,
That is the voltage difference between the source electrode and grid of the field effect transistor P is 0, the field effect transistor P shutdown.
The over-current detection circuit 6 in the present embodiment can use over-current detection circuit in the prior art, the present invention
Embodiment is without limitation.
Further, the current limiting switch circuit can also include the 4th resistance R4, the first end of the 4th resistance R4
The charging control signal VC is received, the second end of the 4th resistance R4 connects the control terminal of the switch module 2.Described
Four resistance R4 the operational amplifier can be isolated with over-current detection circuit 6 and flow control switch S excessively, to avoid flow control is crossed
Influencing each other between signal SW and charging control signal VC processed.
It please also refer to Fig. 3, Fig. 4, wherein Fig. 4 is a kind of schematic diagram of concrete application scene of the embodiment of the present invention.
The output end of the voltage conversion device A be connected to a plurality of branch (such as: two branches, wherein a branch is
Bringing onto load branch, another branch are unloaded branch), a plurality of branch can use mutually isostructural current limiting switch circuit.
For bringing onto load branch, there is the first Input voltage terminal IN1 and the first output voltage terminal OUT1.Described
When current limiting switch circuit initial launch, the association voltage VB is less than the first reference voltage VREF1, the charging control signal VC
It is open-minded to control the field effect transistor P, charges for the first output voltage terminal OUT1.The first output voltage terminal OUT1
Voltage VOUT1 can be calculated by following formula:
VOUT1=VREF1* (R2+R3)/R3
Wherein, the VREF1 is the voltage value of the first reference voltage in bringing onto load branch, and R2 is the second electricity in division module
The resistance value of resistance, R3 are the resistance value of 3rd resistor in division module.
In the specific implementation, by adjusting the size of the voltage value of the first reference voltage VREF1, it can control described first
The size of the voltage value of output voltage terminal OUT1, that is, can control the size for being supplied to the charging voltage of load.
Since sampling resistor Rsense and the loss of field effect transistor P can be ignored, as the association voltage VB
When equal with the first reference voltage VREF, the voltage of the first output voltage terminal OUT1 reaches stable state.If described
Route between first output voltage terminal OUT1 and load is not lost, then the expectation charging voltage of load-receipt is described the
The voltage of one output voltage terminal OUT1 reaches voltage value when stable state.But in fact, the first output voltage terminal OUT1 and negative
Charging circuit between load it is often longer (such as: 0.5m or 1m).Therefore, it will cause when charging current flows through the charging circuit
Bigger line loss, charging current is bigger, and the line loss is also bigger.In this case, the reality of load-receipt
Border charging voltage will be less than desired charging voltage, affect the efficiency of load charging.
In the present embodiment, the input current of the first Input voltage terminal IN1 flows through the charging circuit with load connection, and
Line loss is generated on charging circuit.In order to make up the line loss, it is defeated that the sampling module 1 can acquire described first
Enter the input current of voltage end IN1, and convert control voltage for the input current, the control voltage controls the first electric current
Source I1 generates the first electric current, and first electric current flows through first resistor R1, and the voltage of the first resistor R1 first end is provided to
The control terminal of second current source I2, so that the second current source I2 generates compensation electric current, the compensation electric current flows through the second electricity
Hinder R2, to improve the voltage of the first output voltage terminal OUT1, at this point, load-receipt to be charged as after the raising
Voltage subtracts the voltage of line loss, that is to say, that and compensating module 3 passes through the voltage for improving the first output voltage terminal OUT1, from
And compensate for the line loss voltage of charging circuit, thus make load-receipt to voltage be still desired charging voltage.
During to load charging, when the electric current of the first Input voltage terminal IN1 increases, the charging circuit
Line loss increase.At this point, the received control voltage of the control terminal of the first current source I1 increases, the first current source I1 is produced
The first raw electric current increases, and the voltage of the first end of first resistor R1 increases, the compensation electric current that the second current source I2 is generated
Increase, and then improve the offset voltage to the first output voltage terminal OUT1, make load-receipt to voltage be still the phase
The charging voltage of prestige.
In addition, by the resistance value size for adjusting first resistor R1, the compensation electric current of adjustable second current source I2 generation
Size, and then it is adjustable compensation to the first output voltage terminal OUT1 voltage size.
During to load charging, when the input current that the over-current detection circuit 6 receives is more than described
Predetermined current then generated flow control signals SW.Flow control signals SW is crossed in response to described, the flow control switch S that crosses is closed,
To make the grid of the source electrode and field effect transistor P of the field effect transistor P link together.At this point, the field-effect
Voltage difference between the source electrode and grid of transistor P is 0, then does not have electric current and pass through from field effect transistor P, so as to have
Effect avoids impact of the overcurrent to circuit components and load.
For unloaded branch, there is the second Input voltage terminal IN2 and the second output voltage terminal OUT2, and described
Second output voltage terminal OUT2 does not connect load, i.e., unloaded.
Specifically, in the current limiting switch circuit initial launch, the association voltage VB is less than the second reference voltage
VREF2, the charging control signal VC control field effect transistor P is open-minded, fills for the second output voltage terminal OUT2
Electricity, with the raising of the output voltage of the second output voltage terminal OUT2, the association voltage VB and the second reference voltage VREF2 it
Between voltage difference reduce；After the voltage difference between the association voltage VB and the second reference voltage VREF2 is decreased to 0,
The association voltage VB is equal to the second reference voltage VREF2, and the output voltage of the second output voltage terminal OUT2 reaches
Stable state.Due to being linear ratio relation between the association voltage VB and the second reference voltage VREF2, in order to prevent second
The output voltage of output voltage terminal OUT2 is more than specification, it is only necessary to by the way that the voltage value of the second reference voltage VREF2 is rationally arranged,
It can be by the output voltage control of the second output voltage terminal OUT2 in reasonable range.
Further, the embodiment of the invention also provides a kind of switching power unit (not shown), including Switching Power Supply, also
Including current limiting switch circuit above-mentioned.
Further, the Switching Power Supply may include BUCK circuit, BOOST circuit or BUCK-BOOST circuit,
The output end of the Switching Power Supply can connect the Input voltage terminal of the current limiting switch circuit, the current limiting switch circuit it is defeated
Voltage end can connect load out, be charged with realizing to load.
It should be noted that the voltage value of " high pressure " and " low pressure " in the embodiment of the present invention and being not specifically limited, only
The voltage value of high pressure is wanted to be higher than the voltage value of low pressure.For example, the voltage value of high pressure can be identified as logic 1, and low pressure
Voltage value can be identified as logical zero.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (12)
1. a kind of current limiting switch circuit has Input voltage terminal and output voltage terminal characterized by comprising voltage controls mould
Block, the first input end of the voltage control module receive association voltage, and the second input terminal of the voltage control module receives
Reference voltage, the voltage control module generate charging control signal, the charging according to the association voltage and reference voltage
It controls signal to export via the output end of the voltage control module, wherein the voltage that is associated with is with the voltage of output voltage terminal
Variation and change；
Switch module, the input terminal of the switch module receive the input current of the Input voltage terminal, and according to the charging
Control signal determines whether the output voltage terminal charging；
Compensating module, suitable for generating compensation electric current according to the input current of the Input voltage terminal, the compensation electric current is used
In to the output voltage terminal provide compensation.
2. current limiting switch circuit according to claim 1, which is characterized in that further include:
Sampling module suitable for receiving the input current of the Input voltage terminal, and converts control voltage for the input current,
The control voltage is used to control the size for the compensation electric current that the compensating module generates.
3. current limiting switch circuit according to claim 2, which is characterized in that the compensating module includes: the first current source,
The input terminal of first current source connects power supply, and the control terminal of first current source receives the control voltage；
First resistor, the first end of the first resistor connect the output end of first current source, and the of the first resistor
Two ends ground connection；
Second current source, the control terminal of second current source connect the output end of first current source, second electric current
The output end in source is grounded, and the input terminal of second current source is the output end of the compensating module.
4. current limiting switch circuit according to claim 3, which is characterized in that
When the electric current of the Input voltage terminal increases, the received control voltage of the control terminal of first current source increases, institute
The first electric current for stating the generation of the first current source increases, and the voltage of the first end of first resistor increases, and second current source generates
The second electric current increase, second electric current to the output voltage terminal provide compensation so that the output of the output voltage terminal
Voltage increases.
5. current limiting switch circuit according to claim 1, which is characterized in that further include:
Division module, the division module are suitable for receiving the voltage of the output voltage terminal, and generate the association voltage.
6. current limiting switch circuit according to claim 5, which is characterized in that the division module includes: second resistance, institute
The first end for stating second resistance connects the output voltage terminal；
3rd resistor, the first end of the 3rd resistor connect the second end of the second resistance, and the second of the 3rd resistor
End ground connection, wherein the first end of the 3rd resistor is the output end of the division module.
7. current limiting switch circuit according to claim 1, which is characterized in that the switch module includes: field effect transistor
Pipe, the source electrode of the field effect transistor receive the input current, and the drain electrode of the field effect transistor connects the output
The grid of voltage end, the field effect transistor receives the charging control signal.
8. current limiting switch circuit according to claim 7, which is characterized in that
In circuit initial launch, the association voltage is less than the reference voltage, and the charging control signal controls the field
Effect transistor is open-minded, charges for the output voltage terminal；
With the raising of the output voltage of output voltage terminal, the voltage difference between the association voltage and reference voltage reduces,
After the voltage difference between the association voltage and reference voltage is decreased to 0, the association voltage is equal to the reference voltage,
The output voltage of the output voltage terminal reaches stable state.
9. current limiting switch circuit according to claim 1, which is characterized in that the voltage control module includes:
Operational amplifier, the first input end of the operational amplifier receive the reference voltage, and the of the operational amplifier
Two input terminals receive the association voltage, and the output end of the operational amplifier generates the charging control signal.
10. current limiting switch circuit according to claim 1, which is characterized in that it further include the 4th resistance, the 4th resistance
First end receive the charging control signal, the second end of the 4th resistance connects the control terminal of the switch module.
11. current limiting switch circuit according to claim 1, which is characterized in that further include:
Over-current detection circuit, the over-current detection circuit are suitable for receiving the input of predetermined current and the Input voltage terminal
Electric current, and flow control signals were generated according to the comparison result of the input current and predetermined current；
Flow control switch is crossed, the input terminal for crossing flow control switch connects the input terminal of the switch module, described to cross flow control
The output end of system switch connects the control terminal of the switch module, and the control terminal reception for crossing flow control switch is described to cross flow control
Signal processed, it is described to cross flow control switch on or off under the control for crossing flow control signals.
12. a kind of switching power unit, including Switching Power Supply, which is characterized in that further include described in claim any one of 1-11
Current limiting switch circuit.
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| CN201811146621.5A CN109327131B (en) | 2018-09-29 | 2018-09-29 | Current-limiting switch circuit and switching power supply device |
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| CN201811146621.5A CN109327131B (en) | 2018-09-29 | 2018-09-29 | Current-limiting switch circuit and switching power supply device |
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| CN109327131B CN109327131B (en) | 2020-07-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244111A (en) * | 2019-07-19 | 2019-09-17 | 广东浪潮大数据研究有限公司 | A kind of plate end power supply proximally and distally device for detecting voltage |
| CN111176362A (en) * | 2020-01-10 | 2020-05-19 | 丰县云鸣电子科技有限公司 | Double-line loss compensation method based on DCDC converter |
| CN111653304A (en) * | 2020-04-27 | 2020-09-11 | 中国科学院微电子研究所 | Memory and current-limiting protection circuit thereof |
| CN112017715A (en) * | 2020-08-24 | 2020-12-01 | 厦门半导体工业技术研发有限公司 | Resistive random access memory and protection circuit thereof |
| CN112015220A (en) * | 2019-05-29 | 2020-12-01 | 晶豪科技股份有限公司 | Current limiter |
| CN113098236A (en) * | 2021-04-16 | 2021-07-09 | 苏州力生美半导体有限公司 | Switching power supply and output voltage compensation circuit thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562452A (en) * | 2008-12-30 | 2009-10-21 | 天津南大强芯半导体芯片设计有限公司 | Voltage-current converter circuit |
| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback method thereof |
-
2018
- 2018-09-29 CN CN201811146621.5A patent/CN109327131B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562452A (en) * | 2008-12-30 | 2009-10-21 | 天津南大强芯半导体芯片设计有限公司 | Voltage-current converter circuit |
| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback method thereof |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112015220A (en) * | 2019-05-29 | 2020-12-01 | 晶豪科技股份有限公司 | Current limiter |
| CN112015220B (en) * | 2019-05-29 | 2022-02-11 | 晶豪科技股份有限公司 | Current limiter |
| CN110244111A (en) * | 2019-07-19 | 2019-09-17 | 广东浪潮大数据研究有限公司 | A kind of plate end power supply proximally and distally device for detecting voltage |
| CN110244111B (en) * | 2019-07-19 | 2021-06-29 | 广东浪潮大数据研究有限公司 | Plate-end power supply near-end and far-end voltage detection device |
| CN111176362A (en) * | 2020-01-10 | 2020-05-19 | 丰县云鸣电子科技有限公司 | Double-line loss compensation method based on DCDC converter |
| CN111653304A (en) * | 2020-04-27 | 2020-09-11 | 中国科学院微电子研究所 | Memory and current-limiting protection circuit thereof |
| CN111653304B (en) * | 2020-04-27 | 2022-07-08 | 中国科学院微电子研究所 | Memory and current-limiting protection circuit thereof |
| CN112017715A (en) * | 2020-08-24 | 2020-12-01 | 厦门半导体工业技术研发有限公司 | Resistive random access memory and protection circuit thereof |
| CN112017715B (en) * | 2020-08-24 | 2022-12-06 | 厦门半导体工业技术研发有限公司 | Resistive random access memory and protection circuit thereof |
| CN113098236A (en) * | 2021-04-16 | 2021-07-09 | 苏州力生美半导体有限公司 | Switching power supply and output voltage compensation circuit thereof |
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| CN109327131B (en) | 2020-07-28 |
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