CN209658905U - A kind of flow equalizing circuit - Google Patents
A kind of flow equalizing circuit Download PDFInfo
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- CN209658905U CN209658905U CN201920440400.2U CN201920440400U CN209658905U CN 209658905 U CN209658905 U CN 209658905U CN 201920440400 U CN201920440400 U CN 201920440400U CN 209658905 U CN209658905 U CN 209658905U
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Abstract
The utility model discloses a kind of flow equalizing circuits, pass through the setting to the first amplifier and the second amplifier, i.e. by the electrode input end and negative input interconnection of the first amplifier and the second amplifier, the voltage signal that first amplifier and the second amplifier are exported according to the first sampling module and the second sampling module, the adjustment module of the corresponding electrical connection of control, so that the electric current of branch where the first adjustment module and the adjustment of the second adjustment module, so that the absolute value of the difference of the current value in the first branch and second branch is less than preset threshold, to realize the adjusting to electric current on two branches, so that the electric current of two branch roads is more nearly, to guarantee the normal operation of system.
Description
Technical field
The utility model relates to hardware technology field, espespecially a kind of flow equalizing circuit.
Background technique
In order to guarantee the reliability of power supply or improve the load capacity of system, it is often necessary to design the confession of two-way power sources in parallel
Electricity.Since different power supply output impedances and voltage can be variant, the output electric current that will result in two-way power supply in this way is different,
Even completely by power supply power supply all the way.In this way, when the electric current that system needs is greater than the electric current that single channel power supply can be provided, power supply
Protection, which will be generated, leads to that system is powered down, under more serious situation, may result in system failure, loss of data and other not
The consequence that can be estimated.
So, how to adjust the electric current of two-way power supply output to guarantee the normal operation of system is those skilled in the art
Technical problem urgently to be resolved.
Utility model content
The utility model embodiment provides a kind of flow equalizing circuit, to adjust the electric current of two-way power supply output, to guarantee
The normal operation of system.
The utility model embodiment provides a kind of flow equalizing circuit, including the first branch and second branch, the equal galvanic electricity
Road has a power supply signal output end, and the power supply signal output end respectively with one end of the first branch and second described
The one end on road is electrically connected, the other end and first voltage power electric connection of the first branch, the other end of the second branch
With second voltage power electric connection；The first branch includes the first sampling module and the first adjustment module, the second branch
Including the second sampling module and the second adjustment module；
The flow equalizing circuit further includes the first amplifier and the second amplifier；The electrode input end of first amplifier point
It is not electrically connected with the negative input of second amplifier and first sampling module, the cathode of first amplifier is defeated
Enter end to be electrically connected with the electrode input end of second amplifier and second sampling module respectively, first amplifier
Output end is electrically connected with first adjustment module, and the output end of second amplifier is electrically connected with second adjustment module
It connects；
First sampling module and second sampling module are used to be converted to the current signal of place branch road
It exports after voltage signal to first amplifier and second amplifier；
First amplifier and second amplifier are used to according to the voltage signal received, control pair
The adjustment module that should be electrically connected, so that the electric current of branch where first adjustment module and second adjustment module adjustment,
So that the absolute value of the difference of the current value in the first branch and the second branch is less than preset threshold.
It is by the setting to the first amplifier and the second amplifier, i.e., the anode of the first amplifier and the second amplifier is defeated
Enter end and negative input interconnection, allow the first amplifier and the second amplifier according to the voltage signal received,
The adjustment module of the corresponding electrical connection of control, so that the electric current of branch where the first adjustment module and the adjustment of the second adjustment module, makes
The absolute value of the difference for obtaining the current value in the first branch and second branch is less than preset threshold, to realize to two branch roads
The adjusting of electric current, so that the electric current of two branch roads is more nearly, to guarantee the normal operation of system.
Optionally, first adjustment module includes: the first transistor, first resistor, the first Zener diode；
The grid of the first transistor is electrically connected with the output end of first amplifier, source electrode and the first voltage
Power electric connection, drain electrode are electrically connected with first sampling module；
The first resistor is connected between the grid and source electrode of the first transistor；
First Zener diode is connected to the grid of the first transistor and the output end of first amplifier
Between；
Second adjustment module includes: second transistor, second resistance, the second Zener diode；
The grid of the second transistor is electrically connected with the output end of second amplifier, source electrode and the second voltage
Power electric connection, drain electrode are electrically connected with second sampling module；
The second resistance is connected between the grid and source electrode of the second transistor；
Second Zener diode is connected to the grid of the second transistor and the output end of second amplifier
Between.
To which the function of the first adjustment module and the second adjustment module can be realized by simple structure.And first
Adjustment module is identical with the structure of the second adjustment module, facilitates the electricity when realizing automatic principal and subordinate distribution on the road equilibrium Liang Tiaozhi
Stream.
Optionally, the first transistor and the second transistor are P-type transistor；
The first resistor is identical as the resistance value of the second resistance；
First Zener diode is identical as the performance of second Zener diode.
Optionally, first amplifier and second amplifier are operational amplifier or comparator.
To which the function of the first amplifier and the second amplifier can be realized by simple structure.
Optionally, for the first branch, first adjustment module be set to first sampling module with it is described
Between first voltage power supply；
For the second branch, second adjustment module is set to second sampling module and the second voltage
Between power supply.
Certainly, the setting position of the first sampling module and the second sampling module is not limited to this, can also be according to practical need
It is adjusted.
Optionally, first sampling module includes: 3rd resistor, the 4th resistance and the 5th resistance；
The 3rd resistor is connected between first node and the power supply signal output end；
4th resistance is connected between the first node and second node；
5th resistance is connected between the second node and ground terminal；
Wherein, node of the first node between first adjustment module and first sampling module, it is described
Second node is to be electrically connected respectively with the negative input of the electrode input end of first amplifier and second amplifier
Node；
Second sampling module includes: the 6th resistance, the 7th resistance and the 8th resistance；
6th resistance is connected between third node and the power supply signal output end；
7th resistance is connected between the third node and fourth node；
8th resistance is connected between the fourth node and ground terminal；
Wherein, node of the third node between second adjustment module and second sampling module, it is described
Fourth node is to be electrically connected respectively with the electrode input end of the negative input of first amplifier and second amplifier
Node.
To which the function of the first sampling module and the second sampling module can be realized by the structure that letter is answered.
Optionally, the 3rd resistor is identical as the resistance value of the 6th resistance；
4th resistance is identical as the resistance value of the 7th resistance；
5th resistance is identical as the resistance value of the 8th resistance.
Optionally, the first branch further include: be set to the first voltage power supply and first adjustment module it
Between the first reverse-filling module, for preventing electric current from flowing backward from the second voltage power supply to the first voltage power supply；
The second branch further include: second be set between the second voltage power supply and second adjustment module
Reverse-filling module, for preventing electric current from flowing backward from the first voltage power supply to the second voltage power supply.
It is thus possible to protect first voltage power supply and second voltage power supply.
Optionally, the first reverse-filling module includes first diode；The cathode of the first diode and described the
The electrical connection of one adjustment module, the positive and first voltage power electric connection；
The second reverse-filling module includes the second diode；The cathode of second diode and described second adjusts mould
Block electrical connection, the positive and second voltage power electric connection.
Optionally, the current value in the first branch is less than the current value in the second branch, the preset threshold
10% greater than 0 and no more than the current value in the second branch；
Or, the current value in the first branch is greater than the current value in the second branch, the preset threshold is greater than 0
And no more than 10% of the current value in the first branch.
The utility model has the beneficial effect that:
A kind of flow equalizing circuit provided by the embodiment of the utility model, by being set to the first amplifier and the second amplifier
It sets, i.e., by the electrode input end and negative input interconnection of the first amplifier and the second amplifier, so that the first amplifier
The voltage signal that can be exported according to the first sampling module and the second sampling module with the second amplifier, controls corresponding electrical connection
Adjustment module, so that the electric current of branch where the first adjustment module and the adjustment of the second adjustment module, so that the first branch and second
The absolute value of the difference of the current value of branch road is less than preset threshold, so that the adjusting to electric current on two branches is realized, so that
The electric current of two branch roads is more nearly, to guarantee the normal operation of system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of flow equalizing circuit in the prior art；
Fig. 2 is the structural schematic diagram of the first flow equalizing circuit provided in the utility model embodiment；
Fig. 3 is the concrete structure schematic diagram of Fig. 2；
Fig. 4 is the structural schematic diagram of second of the flow equalizing circuit provided in the utility model embodiment；
Fig. 5 is the concrete structure schematic diagram of Fig. 4.
Specific embodiment
Below in conjunction with attached drawing, to a kind of specific embodiment progress of flow equalizing circuit provided by the embodiment of the utility model
It explains in detail.It should be noted that the described embodiments are only a part of the embodiments of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
Inventor has found under study for action, in current technology, in order to adjust the electric current of two-way power supply output, gives one
Kind flow equalizing circuit, structure is as shown in Figure 1, include first branch L1 and second branch L2, flow equalizing circuit is exported with power supply signal
OUTPUT is held, one end of first branch L1 is electrically connected with power supply signal output end OUTPUT with one end of second branch L2；The
The other end and first voltage power electric connection of one branch L1, the other end and second voltage power electric connection of second branch L2.
Flow equalizing circuit further includes three comparators (such as T1, T2 and T3) being set between first branch L1 and second branch L2, and first
Branch L1 includes the first sample circuit and current regulating circuit, and second branch L2 includes the second sample circuit；Wherein it is possible to will be with
The second voltage power supply of second branch L2 electrical connection is known as main power source, and the first voltage power supply being electrically connected with first branch L1 is claimed
Using the electric current on second branch L2 as reference current, the electric current on first branch L1 to be adjusted, to reach two branch from power supply
The electric current of road is equal or the effect of infinite approach, to achieve the purpose that flow.
However, due to the voltage of first voltage power supply and second voltage power input be it is certain, on first branch L1
Electric current when being greater than the electric current on second branch L2, can by current regulating circuit come to reduce the road load current, thus
Achieve the purpose that flow；If electric current on first branch L1 is less than the electric current on second branch L2, because on second branch L2 not
Current regulating circuit is set, so adjusting the electric current on second branch L2, that is, the electric current for being unable to reach the output of two branches is equal
Effect；Therefore, flow equalizing circuit shown in FIG. 1 needs to guarantee that first voltage power supply needs to possess higher load capacity (i.e. more
Small internal resistance), just it is able to achieve the purpose flowed.
Further, flow equalizing circuit shown in FIG. 1 has to differentiate between principal and subordinate's branch, i.e., first branch L1 is referred to as from branch
Second branch L2 is referred to as main branch by road.But this is very inconvenient also shortage flexibility in actual use.One
The voltage of two power supplys of denier output is not known or output voltage changes in use, and (when load variation, voltage fluctuation is
It is very normal), it is possible to cause smaller from the electric current of branch road and can not flow.In order to solve this problem, it actually uses
In joined secondary pressure circuit in the main branch, reduced by this circuit main power source (i.e. second voltage power supply) output electricity
Pressure reduces the electric current from branch road, output electricity higher from the output voltage of power supply (i.e. first voltage power supply) to ensure with this
It flows bigger.
This method can solve two uncertain problems of branch circuit load ability to a certain extent, but secondary pressure
Circuit is forced to reduce the output voltage of second voltage power supply, can bring biggish loss.If this pressure drop (the i.e. second electricity
Voltage source output voltage pressure drop) setting it is smaller, when first voltage power supply output voltage it is more defeated than second voltage power supply
Voltage out is low, and when difference is greater than the pressure drop of secondary pressure circuit, and can return to aforementioned problem-from power supply (i.e. the
One voltage source) output voltage be lower than main power source (i.e. second voltage power supply) output voltage, cause be lost effect.
Based on this, for the simpler electric current for effectively adjusting the output of two-way power supply, to guarantee the normal operation of system,
The utility model embodiment provides a kind of flow equalizing circuit, as shown in Figure 2.
Specifically, shown in Figure 2, flow equalizing circuit includes: first branch L1 and second branch L2, the flow equalizing circuit tool
Have a power supply signal output end OUTPUT, and the power supply signal output end OUTPUT respectively with one end of the first branch L1 and
One end of the second branch L2 is electrically connected, and the other end of the first branch L1 is electrically connected with first voltage power supply 20, described
The other end of second branch L2 is electrically connected with second voltage power supply 30；First branch L1 includes that the first sampling module 60 and first is adjusted
Module 40 is saved, second branch L2 includes the second sampling module 70 and the second adjustment module 50；
Flow equalizing circuit further includes the first amplifier T1 and the second amplifier T2；The electrode input end of first amplifier T1 is distinguished
It is electrically connected with the negative input of the second amplifier T2 and the first sampling module 60, the negative input difference of the first amplifier T1
It is electrically connected with the electrode input end of the second amplifier T2 and the second sampling module 70, the output end of the first amplifier T1 and first is adjusted
It saves module 40 to be electrically connected, the output end of the second amplifier T2 is electrically connected with the second adjustment module 50；
First sampling module 60 and second sampling module 70 are used to turn the current signal of place branch road
It exports after being changed to voltage signal to the first amplifier T1 and the second amplifier T2；
First amplifier T1 and the second amplifier T2 is used to control corresponding electrical connection according to the voltage signal received
Adjustment module (such as 40 or 50) so that the first adjustment module 40 and the second adjustment module 50 adjustment where branch electric current, make
The absolute value of the difference for obtaining the current value on first branch L1 and second branch L2 is less than preset threshold.
It should be noted that preset threshold is greater than 0, and the tool of preset threshold in the utility model embodiment
Body numerical value is related with the size relation of the current value in the first branch and second branch.
Optionally, when the current value on first branch L1 is less than the current value on second branch L2, preset threshold can be big
In 0 and no more than 10% of the current value on second branch L2.For example, the current value on first branch L1 is indicated with I1, and I1
Current value on=4A, second branch L2 is indicated with I2, and when I2=3.8A, the 10% of I1-I2=4-3.8=0.2A, I2 is
0.38A, because 0.2A is less than 0.38A, so passing through the control of the first amplifier T1 and the second amplifier T2, the first adjustment module 40
With the adjusting of the second adjustment module 50, achieve the purpose that flow.
Optionally, when the current value on first branch L1 is greater than the current value on second branch L2, preset threshold can be big
In 0 and no more than 10% of the current value on first branch L1.For example, the current value on first branch L1 is indicated with I1, and I1
Current value on=3.5A, second branch L2 is indicated with I2, and when I2=4A, the 10% of I2-I1=4-3.5=0.5A, I1 is
0.35A, because 0.5A is greater than 0.35A, so also needing to continue by the first amplifier T1 and the second amplifier T2 to adjust to first
Module 40 and the second adjustment module 50 are controlled, so that the difference of first branch L1 and the current value on second branch L2 is absolute
Value is less than preset threshold.
That is, preset threshold is 10% of lesser branch current in two branches.Certainly, preset threshold and unlimited
In this, 5% or 3% etc. of first branch L1 or the current value on second branch L2 may be arranged as, it can be according to actual
Depending on stream precision.
Since the electrode input end and negative input of the first amplifier T1 and the second amplifier T2 are interconnections, because
This its working condition is mutual exclusion, i.e., only one amplifier is in running order simultaneously, so the amplifier can control pair
The adjustment module that should be electrically connected adjusts electric current, another amplifier then makes the corresponding adjustment module being electrically connected lose current regulation
Ability.Therefore, if the first amplifier T1 is in running order, then the first amplifier T1 can be with the electric current on second branch L2
Benchmark, the first adjustment module 40 of control adjusts the electric current on second branch L2, so that electric current is more nearly on two branches, to protect
The normal operation of card system.
Also, in the utility model embodiment, by the control action of the first amplifier T1 and the second amplifier T2, also
Can be according to first voltage power supply 20 and second voltage 30 output voltage of power supply the case where, is automatically realized principal and subordinate's distribution, i.e., certainly
The higher power supply of fan-out capability is set main power source by dynamic ground, and the branch being electrically connected with main power source is main branch, by another electricity
Source is set as from power supply, with the branch from power electric connection i.e. from branch.In this way, distinguishing principal and subordinate without artificial for a user
Power supply substantially increases the flexibility of operation.
In addition, because realizing automatic principal and subordinate distribution, so no setting is required secondary pressure circuit, so as to substantially reduce
The cost of manufacture of current circuit can also improve power supply efficiency.
In the specific implementation, in the utility model embodiment, as shown in figure 3, the first adjustment module 40 may include:
One transistor Q1, first resistor R1, the first Zener diode Z1；Wherein, the grid of the first transistor Q1 and the first amplifier T1
Output end electrical connection, source electrode is electrically connected with first voltage power supply 20, drains and is electrically connected with the first sampling module 60；By to the
Apply certain voltage, i.e., the impedance of controllable the first transistor Q1, to reach limit between the grid and source electrode of one transistor Q1
The purpose of stream.First resistor R1 is connected between the grid and source electrode of the first transistor Q1, is mentioned for the grid of the first transistor Q1
For biasing；First Zener diode Z1 is connected between the grid of the first transistor Q1 and the output end of the first amplifier T1, is used
To raise the grid voltage of the first transistor Q1, threshold value electricity of the pressure difference between grid and source electrode greater than the first transistor Q1 is prevented
Pressure.
As shown in figure 3, the second adjustment module 50 may include: second transistor Q2, second resistance R2, two pole of the second Zener
Pipe Z2；Wherein, the grid of second transistor Q2 is electrically connected with the output end of the second amplifier T2, source electrode and second voltage power supply 30
Electrical connection, drain electrode are electrically connected with the second sampling module 70；By certain to applying between the grid and source electrode of second transistor Q2
Voltage, i.e., the impedance of controllable second transistor Q2, to achieve the purpose that current limliting.Second resistance R2 is connected to second transistor
Between the grid and source electrode of Q2, the grid for second transistor Q2 provides biasing；Second Zener diode Z2 is connected to the second crystalline substance
Between the grid of body pipe Q2 and the output end of the second amplifier T2, to raise the grid voltage of second transistor Q2, grid are prevented
Pressure difference between pole and source electrode is greater than the threshold voltage of second transistor Q2.
Specifically, in the utility model embodiment, the first transistor Q1 and second transistor Q2 are P-type transistor；
By taking the first transistor Q1 as an example, in the grid input low level signal of the first transistor Q1, the first transistor Q1 is on
State, the first transistor Q1 will not play metering function at this time, be equivalent to a conducting wire；It is defeated in the grid of the first transistor Q1
When entering high level signal, the first transistor Q1 is closed, and by the control of the level to high level signal, so that first crystal
Pipe Q1 can play the role of current limliting, so as to adjust the electric current for flowing through the first transistor Q1.Also, the electricity of first resistor R1 and second
The resistance value of resistance R2 is set as identical.First Zener diode Z1 is identical with the structure of the second Zener diode Z2 and performance.
Therefore, the structure of the first adjustment module 40 and the second adjustment module 50 is identical, is flowed in order to reduce
The manufacture difficulty of circuit.Also, so set, every branch both can be main branch, or from branch, and two branches
Regardless of based on which, which is from the electric current from branch road being adjusted in the same way, to reach the mesh flowed
, guarantee the normal operation of system.
In the specific implementation, in the utility model embodiment, the first amplifier T1 and the second amplifier T2 all can be
Operational amplifier or comparator.It is, of course, also possible to be the structure that enlarging function may be implemented in other, do not limit herein.
By taking the first amplifier T1 and the second amplifier T2 is comparator as an example, it is defeated to be greater than cathode in the voltage of electrode input end
When entering the voltage at end, output end can export high level signal, when the voltage of electrode input end is less than the voltage of negative input,
Output end can export low level signal, so that the opening degree of the first transistor Q1 and second transistor Q2 are controlled, adjustment first
Electric current on branch L1 and second branch L2.
Therefore, when the first amplifier T1 and the second amplifier T2 is comparator, the first amplifier T1 and the is enabled to
Two amplifier T2 are worked normally, and in the utility model embodiment, are needed through the first sampling module 60 and the second sampling module
70, it exports after the current signal of place branch road is converted to voltage signal to the first amplifier T1 and the second amplifier T2.
That is, the electric current on the first sampling module 60 acquisition first branch L1, and collected current signal is turned
It changes the voltage signal that the first amplifier T1 and the second amplifier T2 can be identified into, then exports to the first amplifier T1 and second
Amplifier T2.Similarly, the electric current on the second sampling module 70 acquisition second branch L2, and collected current signal is converted
At the voltage signal that the first amplifier T1 and the second amplifier T2 can be identified, then exports to the first amplifier T1 and second and put
Big device T2, so that the first amplifier T1 and the second amplifier T2 can be inputted according to electrode input end and negative input
The size relation of voltage signal exports high level signal and/or low level signal, to control the first transistor Q1 and the second crystal
The opening degree of pipe Q2 plays the role of adjusting electric current.
It should be noted that the first sampling module 60 can be set in first branch L1 in the utility model embodiment
On any position；For example, as shown in Fig. 2, the first output end of the first sampling module 60 respectively with the first amplifier T1 just
The electrical connection of the negative input of pole input terminal and the second amplifier T2, second output terminal are electrically connected with power supply signal output end OUTPUT
It connects, input terminal is electrically connected with the first adjustment module 40；In another example the first output end of the first sampling module 60 is put with first respectively
The negative input electrical connection of the electrode input end and the second amplifier T2 of big device T1, second output terminal and the first adjustment module 40
Electrical connection, input terminal are electrically connected with first voltage power supply 20, do not provide diagram, can be configured according to actual needs, herein
It does not limit.
But regardless of which kind of position the first sampling module 60 is arranged in, for the first sampling module 60, structure is identical
, as shown in figure 3, i.e. the first sampling module 60 may include: 3rd resistor R3, the 4th resistance R4 and the 5th resistance R5；Wherein,
3rd resistor R3 is connected between first node P1 and power supply signal output end OUTPUT；4th resistance R4 is connected to first node
Between P1 and second node P2；5th resistance R5 is connected between second node P2 and ground terminal；Wherein, first node P1 is the
Node between one adjustment module 40 and the first sampling module 60, second node P2 are defeated with the anode of the first amplifier T1 respectively
Enter the node at end and the negative input electrical connection of the second amplifier T2.
Similarly, any position on second branch L2 can be set in the second sampling module 70；For example, as shown in figure 3,
First output end of the second sampling module 70 anode with the negative input of the first amplifier T1 and the second amplifier T2 respectively
Input terminal electrical connection, second output terminal are electrically connected with power supply signal output end OUTPUT, 50 electricity of input terminal and the second adjustment module
Connection；In another example the first output end of the second sampling module 70 is put with the negative input of the first amplifier T1 and second respectively
The electrode input end electrical connection of big device T2, second output terminal are electrically connected with the second adjustment module 50, input terminal and second voltage electricity
Source 30 is electrically connected, and is not provided diagram, can be configured, not limit according to actual needs herein.
But regardless of which kind of position the second sampling module 70 is arranged in, for the second sampling module 70, structure is identical
, as shown in figure 3, i.e. the second sampling module 70 may include: the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8；6th
Resistance R6 is connected between third node P3 and power supply signal output end OUTPUT；7th resistance R7 be connected to third node P3 with
Between fourth node P4；8th resistance R8 is connected between fourth node P4 and ground terminal；Wherein, third node P3 is the second tune
The node between module 50 and the second sampling module 70 is saved, fourth node P4 is the negative input with the first amplifier T1 respectively
The node being electrically connected with the electrode input end of the second amplifier T2.
Therefore, the structure of the first sampling module 60 and the second sampling module 70 is identical, is flowed in order to reduce
The manufacture difficulty of circuit.Also, so set, both can be main branch with every branch, or from branch, and two
For branch regardless of based on which, which is and to believe electric current from, the electric current of branch road where can acquiring in the same way
Number being converted to voltage signal exports to the first amplifier T1 and the second amplifier T2.
Specifically, in the utility model embodiment, 3rd resistor R3 is identical as the resistance value of the 6th resistance R6；4th resistance
R4 is identical as the resistance value of the 7th resistance R7；5th resistance R5 is identical as the resistance value of the 8th resistance R8.Wherein, 3rd resistor R3 and
Six resistance R6 may be considered sampling resistor, the electric current for flowing through itself can be converted to voltage, for first branch L1, pass through
The voltage of 3rd resistor R3 conversion is input to first after dividing using the 4th resistance R4 and the 5th resistance R5 to suitable value and puts
Big device T1 and the second amplifier T2, for second branch L2, by the voltage that the 6th resistance R6 is converted, using the 7th resistance R7
The first amplifier T1 and the second amplifier T2 are input to after dividing with the 8th resistance R8 to suitable value.
In the specific implementation, electric current flows backward in order to prevent, to protect first voltage power supply 20 and second voltage power supply 30, In
In the utility model embodiment, as shown in Figure 4 and Figure 5, first branch L1 can also include: be set to first voltage power supply 20 with
The first reverse-filling module 80 between first adjustment module 40, for preventing electric current from flowing backward from second voltage power supply 30 to the first electricity
Voltage source 20；Second branch L2 can also include: second be set between second voltage power supply 30 and the second adjustment module 50
Reverse-filling module 90, for preventing electric current from flowing backward from first voltage power supply 20 to second voltage power supply 30.
Specifically, in the utility model embodiment, as shown in figure 5, the first reverse-filling module 80 includes first diode
D1；The cathode of first diode D1 is electrically connected with the first adjustment module 40, and anode is electrically connected with first voltage power supply 20；Second is anti-
Flowing backward module 90 includes the second diode D2；The cathode of second diode D2 is electrically connected with the second adjustment module 50, anode and the
The electrical connection of two voltage sources 30.
Since first diode D1 being arranged between first voltage power supply 20 and the first adjustment module 40, in second voltage electricity
Second diode D2 is set, and because diode has the function of one-way conduction, so can between source 30 and the second adjustment module 50
Flowed backward with preventing from before flow equalizing circuit work or surprisingly failing electric current from first voltage power supply 20 to second voltage power supply 30 or the
Two voltage sources 30 flow backward to first voltage power supply 20, to protect first voltage power supply 20 and second voltage power supply 30.
It certainly, can be with if first voltage power supply 20 and second voltage power supply 30 carry reverse-filling function, in flow equalizing circuit
It is not provided with the first reverse-filling module 80 and the second reverse-filling module 90, to reduce the cost of manufacture of flow equalizing circuit.
Below with structure shown in fig. 5, the course of work of flow equalizing circuit provided by the embodiment of the utility model is retouched
It states.
Firstly, the electric current I1 on first branch L1 is defined, and the electric current I2 on second branch L2, power supply signal output end
The voltage of OUTPUT is U0, and the voltage of first node P1 is U1, and the voltage of third node P3 is U2, the electricity of 3rd resistor R3 and the 6th
The resistance value for hindering R6 is R0.
Assuming that I1 > I2, U1=U0+I1 × R3, U2=U0+I2 × R6 known to Ohm's law.Again because of R3=R6=R,
So U1 > U2.The voltage of the electrode input end of the second amplifier T2 is less than the voltage of negative input at this time, so second puts
Big device T2 exports low level signal, and such as 0V, second transistor Q2 are fully opened, and will not play the role of current limliting.And the first amplification
The voltage of the electrode input end of device T1 is greater than the voltage of negative input, and the voltage signal of the first amplifier T1 output increases.Such as
This, the Vgs of the first transistor Q1 then reduces, and reduces the communication channel of the first transistor Q1 also, and equivalent impedance increases, to subtract
The small electric current I1 for flowing through the first transistor Q1 finally makes I1 no better than I2.
Illustrate a bit, why be I1 no better than I2 because mentioned above, it is assumed that the electrode input end of amplifier and
Pressure difference between negative input is Vm, and the amplification factor of amplifier is k, then the output voltage of amplifier is V0, then V0=k
×Vm.If I1=I2 is strictly set up, Vm=0V, V0=0V.In this way, the first transistor Q1 just no longer plays metering function,
Flow equalizing circuit can return to the state not flowed again.So being finally reached stable state must be I1 slightly larger than I2, so that first
The output of amplifier T1 is not 0V.
At this point, the error size flowed depends on the value of amplification factor k, the value of k is bigger, to maintain needed for identical V0
Error Vm is with regard to smaller.It generally can be by Amplifier Design in open loop circuit, because the value of k at this time is very big, so the mistake of I1 and I2
Difference can be ignored.Exactly because also I1 is finally centainly slightly larger than I2, it just can guarantee that the second amplifier T2 maintains the output of 0V,
Second transistor Q2 is not allowed to play the role of current limliting.
Due to the structure of two branches be it is full symmetric, the course of work as I2 > I1 is consistent with the above process, only
It is to become the first amplifier T1 output 0V the first transistor Q1 is made not play the role of current limliting.Second amplifier T2 control
Second transistor Q2 reduces I2 and makes I2 ≈ I1 so that second transistor Q2 plays the role of current limliting.As I1=I2, then
One amplifier T1 and the second amplifier T2, which exports 0V, the first transistor Q1 and second transistor Q2, will not play the work of current limliting
With being automatically closed current-limiting function, maximize the working efficiency for improving flow equalizing circuit, reduce unnecessary loss.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (10)
1. a kind of flow equalizing circuit, which is characterized in that including the first branch and second branch, the flow equalizing circuit has power supply signal
Output end, and the one end of the power supply signal output end respectively with one end of the first branch and the second branch is electrically connected
It connects, the other end and first voltage power electric connection of the first branch, the other end and the second voltage electricity of the second branch
Source electrical connection；The first branch includes the first sampling module and the first adjustment module, and the second branch includes the second sampling
Module and the second adjustment module；
The flow equalizing circuit further includes the first amplifier and the second amplifier；The electrode input end of first amplifier respectively with
The negative input of second amplifier and first sampling module electrical connection, the negative input of first amplifier
It is electrically connected respectively with the electrode input end of second amplifier and second sampling module, the output of first amplifier
End is electrically connected with first adjustment module, and the output end of second amplifier is electrically connected with second adjustment module；
First sampling module and second sampling module are used to the current signal of place branch road being converted to voltage
It exports after signal to first amplifier and second amplifier；
First amplifier and second amplifier are used to control corresponding electricity according to the voltage signal received
The adjustment module of connection, so that the electric current of branch where first adjustment module and second adjustment module adjustment, so that
The absolute value of the difference of current value in the first branch and the second branch is less than preset threshold.
2. flow equalizing circuit as described in claim 1, which is characterized in that first adjustment module includes: the first transistor,
One resistance, the first Zener diode；
The grid of the first transistor is electrically connected with the output end of first amplifier, source electrode and the first voltage power supply
Electrical connection, drain electrode are electrically connected with first sampling module；
The first resistor is connected between the grid and source electrode of the first transistor；
First Zener diode is connected between the grid of the first transistor and the output end of first amplifier；
Second adjustment module includes: second transistor, second resistance, the second Zener diode；
The grid of the second transistor is electrically connected with the output end of second amplifier, source electrode and the second voltage power supply
Electrical connection, drain electrode are electrically connected with second sampling module；
The second resistance is connected between the grid and source electrode of the second transistor；
Second Zener diode is connected between the grid of the second transistor and the output end of second amplifier.
3. flow equalizing circuit as claimed in claim 2, which is characterized in that the first transistor and the second transistor are
P-type transistor；
The first resistor is identical as the resistance value of the second resistance；
First Zener diode is identical as the performance of second Zener diode.
4. flow equalizing circuit as described in claim 1, which is characterized in that first amplifier and second amplifier are
Operational amplifier or comparator.
5. flow equalizing circuit as described in claim 1, which is characterized in that be directed to the first branch, first adjustment module
It is set between first sampling module and the first voltage power supply；
For the second branch, second adjustment module is set to second sampling module and the second voltage power supply
Between.
6. flow equalizing circuit as claimed in claim 5, which is characterized in that first sampling module includes: 3rd resistor, the 4th
Resistance and the 5th resistance；
The 3rd resistor is connected between first node and the power supply signal output end；
4th resistance is connected between the first node and second node；
5th resistance is connected between the second node and ground terminal；
Wherein, node of the first node between first adjustment module and first sampling module, described second
Node is the section being electrically connected respectively with the negative input of the electrode input end of first amplifier and second amplifier
Point；
Second sampling module includes: the 6th resistance, the 7th resistance and the 8th resistance；
6th resistance is connected between third node and the power supply signal output end；
7th resistance is connected between the third node and fourth node；
8th resistance is connected between the fourth node and ground terminal；
Wherein, node of the third node between second adjustment module and second sampling module, the described 4th
Node is the section being electrically connected respectively with the electrode input end of the negative input of first amplifier and second amplifier
Point.
7. flow equalizing circuit as claimed in claim 6, which is characterized in that the resistance value phase of the 3rd resistor and the 6th resistance
Together；
4th resistance is identical as the resistance value of the 7th resistance；
5th resistance is identical as the resistance value of the 8th resistance.
8. flow equalizing circuit as described in claim 1, which is characterized in that the first branch further include: be set to described first
The first reverse-filling module between voltage source and first adjustment module, for preventing electric current from the second voltage power supply
Flow backward to the first voltage power supply；
The second branch further include: second be set between the second voltage power supply and second adjustment module is anti-down
Module is filled, for preventing electric current from flowing backward from the first voltage power supply to the second voltage power supply.
9. flow equalizing circuit as claimed in claim 8, which is characterized in that the first reverse-filling module includes first diode；
The cathode of the first diode is electrically connected with first adjustment module, the positive and first voltage power electric connection；
The second reverse-filling module includes the second diode；The cathode of second diode and second adjustment module electricity
Connection, the positive and second voltage power electric connection.
10. such as the described in any item flow equalizing circuits of claim 1-9, which is characterized in that the current value in the first branch is small
Current value in the second branch, the preset threshold are greater than 0 and no more than the current values in the second branch
10%；
Or, current value in the first branch is greater than the current value in the second branch, the preset threshold is greater than 0 and not
Greater than 10% of the current value in the first branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920440400.2U CN209658905U (en) | 2019-04-02 | 2019-04-02 | A kind of flow equalizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920440400.2U CN209658905U (en) | 2019-04-02 | 2019-04-02 | A kind of flow equalizing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209658905U true CN209658905U (en) | 2019-11-19 |
Family
ID=68528732
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920440400.2U Active CN209658905U (en) | 2019-04-02 | 2019-04-02 | A kind of flow equalizing circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209658905U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994585A (en) * | 2019-12-31 | 2020-04-10 | 浙江中控技术股份有限公司 | Power supply system |
| CN113285591A (en) * | 2021-07-22 | 2021-08-20 | 上海芯龙半导体技术股份有限公司南京分公司 | Circuit, chip and method for equalizing output current of two power supply chips |
-
2019
- 2019-04-02 CN CN201920440400.2U patent/CN209658905U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994585A (en) * | 2019-12-31 | 2020-04-10 | 浙江中控技术股份有限公司 | Power supply system |
| CN110994585B (en) * | 2019-12-31 | 2021-10-15 | 浙江中控技术股份有限公司 | Power supply system |
| CN113285591A (en) * | 2021-07-22 | 2021-08-20 | 上海芯龙半导体技术股份有限公司南京分公司 | Circuit, chip and method for equalizing output current of two power supply chips |
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