CN109149551A - A kind of active redundant parallel power-supplying circuit - Google Patents
A kind of active redundant parallel power-supplying circuit Download PDFInfo
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- CN109149551A CN109149551A CN201811083849.4A CN201811083849A CN109149551A CN 109149551 A CN109149551 A CN 109149551A CN 201811083849 A CN201811083849 A CN 201811083849A CN 109149551 A CN109149551 A CN 109149551A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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Abstract
The present invention relates to a kind of active redundant parallel power-supplying circuits, including, switch block, reversal detection components and switch control component；Switch block is connected to the output of single channel DC power supply just between reversal detection components, connects load end by reversal detection components；For being switched on or switched off single channel DC power supply to the power supply of load end；Reversal detection components will test result and be output to switch control component for detecting the size and flow direction for flowing through reversal detection components electric current；The control terminal of switch control component connection switch component is switched on or switched off single channel DC power supply according to the testing result control switch component that reversal detection components export.Circuit form of the present invention is novel, and structure is simple, at low cost, reduces the loss of parallel redundancy circuit, can satisfy the use demand of most of DC power supply parallel redundancy, can apply in all kinds of power-supply devices.
Description
Technical field
This patent is related to power technique fields more particularly to a kind of active redundant parallel power-supplying circuit.
Background technique
Most of electrical equipment is required to power using DC power supply, and most uses in high-power DC power supply use
Multiple DC power supply parallel connections are realized.In order to promote the reliability of high-power DC power supply system, using multiple DC power supply redundancies
Formula is in parallel, positive output end series diode of traditional design scheme in each DC power supply, each DC power supply concatenated two
It powers to the load after the cathode of pole pipe is in parallel, but due to the conductivity modulation effect of diode, the pressure drop of diode is larger, when defeated
When electric current is larger out, diode can generate a large amount of losses, and power-efficient is caused to reduce, and generate heat and reduce the reliable of power supply
Property.
Currently used redundant parallel circuit as shown in Figure 1, its working principle is that: the anode voltage of diode D1 be higher than two
When pole pipe D2 anode voltage, diode D1 conducting, diode D2 shutdown, DC power supply 1 is load supplying；When the sun of diode D1
When pole tension is lower than diode D2 anode voltage, diode D2 conducting, diode D1 shutdown, DC power supply 2 is load supplying.It is logical
It crosses diode D1, D2 and realizes redundant parallel function.
Traditional redundant parallel circuit can satisfy most of redundant parallel use demand.But its disadvantage are as follows: diode is led
Logical pressure drop is about 0.7V, and when passing through high current, diode can generate a large amount of losses.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of active redundant parallel power-supplying circuit, solves tradition
The loss problem of redundant parallel circuit.
The purpose of the present invention is mainly achieved through the following technical solutions:
A kind of active redundant parallel power-supplying circuit, including switch block, reversal detection components and switch control
Component processed；
The switch block is connected to the output of single channel DC power supply just between reversal detection components, passes through positive negative electricity
It flows detection components and connects load end；For being switched on or switched off single channel DC power supply to the power supply of load end；
The reversal detection components；For detecting the size and flow direction that flow through reversal detection components electric current, and
It will test result and be output to switch control component；
The control terminal of the switch control component connection switch component, the detection knot exported according to reversal detection components
Fruit controls the switch block and is switched on or switched off single channel DC power supply.
Further, the switch block includes MOS switch pipe S1 and body diode D1；
The drain electrode of the MOS switch pipe S1 is just being connect with DC power supply output, and source electrode is connected by reversal detection components
Load end is connect, grid is connect with the output end of switch control component；
The anode of the body diode D1 is just being connect with DC power supply output, and cathode is connected by reversal detection components
Load end.
Being switched on or switched off for power supply is controlled by the on and off of MOS switch pipe, and when conducting, MOS switch pipe is not pressed
Drop, a large amount of losses will not be generated when passing through high current.
Further, the reversal detection components include detection resistance R1, detection output and reference ground；
One end of the resistance R1 is connect with switch block, and the other end is connect with load end；Detection output is from resistance R1
It is drawn with switch block connecting pin；It is drawn with reference to ground from the connecting pin of resistance R1 and load end.
Further, the detection resistance R1 is m Ω grades of resistance.
Further, described to be isolated with reference to ground with power ground.
Detection resistance R1 uses m Ω grades of resistance, reduces loss caused by detection resistance access power supply circuit, setting and electricity
The reference ground being isolated to source, can preferably judge the flow direction of electric current on resistance R1, detect convenient for reversal.
Further, the switch control component, including positive current decision circuitry, negative current decision circuitry, switch control
Circuit and switch driving circuit；
The input terminal of the positive current decision circuitry connects reversal detection components output end, the positive current judgement electricity
The switch connection control terminal of the output end connection switch control circuit on road；
The input terminal of the negative current decision circuitry connects reversal detection components output end, the positive current judgement electricity
The switch of the output end connection switch control circuit on road disconnects control terminal；
The output end of the ON-OFF control circuit passes through switch driving circuit connection switch component control terminal；
When reversal detection components output positive current detected value is greater than the positive current threshold value of setting, positive current judgement electricity
Road outputs a control signal to the switch connection control terminal of ON-OFF control circuit, and switch component signals are connected in ON-OFF control circuit output
After amplifying to switch driving circuit, control switch component is connected；
When reversal detection components output negative current detected value is greater than the negative current threshold value of setting, negative current judgement electricity
The switch that road outputs a control signal to ON-OFF control circuit disconnects control terminal, and ON-OFF control circuit output disconnects switch block signal
After amplifying to switch driving circuit, control switch component is disconnected.
Further, the positive current decision circuitry, including amplifier U1, resistance R2, R3；Described resistance R2, R3 are connected on
Between reference voltage Vr and reference ground, the connecting pin of resistance R2, R3 connect the inverting input terminal of the amplifier U1；Reversal inspection
Survey the non-inverting input terminal that component output end connects the amplifier U1, the switch of the output end connection switch control circuit of the amplifier
Connect control terminal.
Further, the negative current decision circuitry, including amplifier U2, amplifier U5, resistance R4, R5, R6 and R7；The fortune
The non-inverting input terminal for putting U5 is connect by resistance R6 with reversal detection components output end, the inverting input terminal of the amplifier U5
It with reference connect, the output end of the amplifier U5 is connect by resistance R7 with the non-inverting input terminal of the amplifier U5；The electricity
Resistance R4, R5 are connected on reference voltage Vr and with reference between ground, and the connecting pin of resistance R4, R5 connect the anti-phase input of the amplifier U2
End, the non-inverting input terminal of the amplifier U2 are connect with the output end of amplifier U5；The output end connection switch of the amplifier U2 controls
The switch of circuit disconnects control terminal.
Further, power-supplying circuit according to claim 7 or 8, which is characterized in that the positive current threshold valueIn the case where R1 resistance value determines, positive current threshold value is adjusted by adjusting the resistance value of R2, R3；Or
Person adjusts positive current threshold value in the case where the resistance value of R2, R3 determine by adjusting the resistance value of R1；
Shown negative current threshold valueIn the case where R1 resistance value determines, by adjusting the electricity of R4, R5
Resistance value adjusts negative current threshold value；Alternatively, adjusting negative current in the case where the resistance value of R4, R5 determine by adjusting the resistance value of R1
Threshold value.
Switch control modular construction is simple, and reversal threshold value can be according to the actual situation by adjusting R2, R3, R4, R5
Resistance value reasonably adjusts, to adapt to the requirement of different electrical power power supply.
Further, the ON-OFF control circuit includes rest-set flip-flop U3, and the end S of the rest-set flip-flop connects the positive electricity
Flow the output end of decision circuitry；The end R of the rest-set flip-flop connects the output end of the negative current decision circuitry；The RS triggering
The end Q of device connects the input terminal of the switch driving circuit.
The present invention has the beneficial effect that:
Active redundant parallel power-supplying circuit disclosed by the invention, novel form, structure is simple, at low cost, reduces
The loss of parallel redundancy circuit can satisfy the use demand of most of DC power supply parallel redundancy, can apply to all kinds of electricity
In source device.
Other features and advantages of the present invention will illustrate in the following description, also, partial become from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written explanation
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is traditional redundant parallel electrograph；
Fig. 2 is that the power-supplying circuit of the embodiment of the present invention forms connection schematic diagram；
Fig. 3 is that the switch block circuit connection of the embodiment of the present invention sets schematic diagram；
Fig. 4 is that the reversal detection components circuit connection of the embodiment of the present invention sets schematic diagram；
Fig. 5 is that schematic diagram is set in the switch control assembly circuit connection of the embodiment of the present invention；
Fig. 6 is that schematic diagram is set in the power-supplying circuit connection of the embodiment of the present invention；
Fig. 7 is that schematic diagram is set in the driving circuit connection of the embodiment of the present invention.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
A specific embodiment of the invention discloses a kind of active redundant parallel power-supplying circuit, such as Fig. 2 institute
Show, including, switch block, reversal detection components and switch control component；
The switch block is connected to the output of single channel DC power supply just between reversal detection components, passes through positive negative electricity
It flows detection components and connects load end；For being switched on or switched off single channel DC power supply to the power supply of load end；
The reversal detection components；For detecting the size and flow direction that flow through reversal detection components electric current, and
It will test result and be output to switch control component；
The control terminal of the switch control component connection switch component, the detection knot exported according to reversal detection components
Fruit controls the switch block and is switched on or switched off single channel DC power supply.
Optionally, as shown in figure 3, the switch block includes MOS switch pipe S1 and body diode D1；
The drain electrode of the MOS switch pipe S1 is just being connect with DC power supply output, and source electrode is connected by reversal detection components
Load end is connect, grid is connect with the output end of switch control component；
The anode of the body diode D1 is just being connect with DC power supply output, and cathode is connected by reversal detection components
Load end.
Being switched on or switched off for power supply is controlled by the on and off of MOS switch pipe, and when conducting, MOS switch pipe is not pressed
Drop, a large amount of losses will not be generated when passing through high current.
Optionally, as shown in figure 4, the reversal detection components include detection resistance R1, detection output and reference
Ground；
One end of the resistance R1 is connect with switch block, and the other end is connect with load end；Detection output is from resistance R1
It is drawn with switch block connecting pin；It is drawn with reference to ground from the connecting pin of resistance R1 and load end.
Specifically, the be connected to load end feeder ear with referring to, is this requires reference to be isolated with power ground,
That is it is not ground on practical significance that the reference ground in the present embodiment, which is a voltage reference points,.
Special, the detection resistance R1 is m Ω grades of resistance.
Detection resistance R1 uses m Ω grades of resistance, reduces loss caused by detection resistance access power supply circuit, setting and electricity
The reference ground being isolated to source, can preferably judge the flow direction of electric current on resistance R1, detect convenient for reversal.
Optionally, the switch control component, including positive current decision circuitry, negative current decision circuitry, switch control electricity
Road and switch driving circuit；
The input terminal of the positive current decision circuitry connects reversal detection components output end, the positive current judgement electricity
The switch connection control terminal of the output end connection switch control circuit on road；
The input terminal of the negative current decision circuitry connects reversal detection components output end, the positive current judgement electricity
The switch of the output end connection switch control circuit on road disconnects control terminal；
The output end of the ON-OFF control circuit passes through switch driving circuit connection switch component control terminal；
When reversal detection components output positive current detected value is greater than the positive current threshold value of setting, positive current judgement electricity
Road outputs a control signal to the switch connection control terminal of ON-OFF control circuit, and switch component signals are connected in ON-OFF control circuit output
After amplifying to switch driving circuit, control switch component is connected；
When reversal detection components output negative current detected value is greater than the negative current threshold value of setting, negative current judgement electricity
The switch that road outputs a control signal to ON-OFF control circuit disconnects control terminal, and ON-OFF control circuit output disconnects switch block signal
After amplifying to switch driving circuit, control switch component is disconnected.
As shown in figure 5, the positive current decision circuitry, including amplifier U1, resistance R2, R3；Described resistance R2, R3 are connected on
Between reference voltage Vr and reference ground, the connecting pin of resistance R2, R3 connect the inverting input terminal of the amplifier U1；Reversal inspection
Survey the non-inverting input terminal that component output end connects the amplifier U1, the switch of the output end connection switch control circuit of the amplifier
Connect control terminal.
The negative current decision circuitry, including amplifier U2, amplifier U5, resistance R4, R5, R6 and R7；The amplifier U5's is same
Phase input terminal is connect by resistance R6 with reversal detection components output end, the inverting input terminal and reference ground of the amplifier U5
The output end of connection, the amplifier U5 is connect by resistance R7 with the non-inverting input terminal of the amplifier U5；Resistance R4, R5 string
It is associated in reference voltage Vr and with reference between ground, the connecting pin of resistance R4, R5 connects the inverting input terminal of the amplifier U2, the fortune
The non-inverting input terminal for putting U2 is connect with the output end of amplifier U5；The switch of the output end connection switch control circuit of the amplifier U2
Disconnect control terminal.
Optionally, power-supplying circuit according to claim 7 or 8, which is characterized in that the positive current threshold valueIn the case where R1 resistance value determines, positive current threshold value is adjusted by adjusting the resistance value of R2, R3；Or
Person adjusts positive current threshold value in the case where the resistance value of R2, R3 determine by adjusting the resistance value of R1；
Shown negative current threshold valueIn the case where R1 resistance value determines, by adjusting the electricity of R4, R5
Resistance value adjusts negative current threshold value；Alternatively, adjusting negative current in the case where the resistance value of R4, R5 determine by adjusting the resistance value of R1
Threshold value.
Switch control modular construction is simple, and reversal threshold value can be according to the actual situation by adjusting R2, R3, R4, R5
Resistance value reasonably adjusts, to adapt to the requirement of different electrical power power supply.
The ON-OFF control circuit includes rest-set flip-flop U3, and the end S of the rest-set flip-flop connects the positive current judgement electricity
The output end on road；The end R of the rest-set flip-flop connects the output end of the negative current decision circuitry；The end Q of the rest-set flip-flop
Connect the input terminal of the switch driving circuit.
The switch driving circuit is according to the control signal driving switch element turns of ON-OFF control circuit or disconnection.Driving
Circuit is as shown in fig. 7, form push-pull driver circuit by resistance R8, triode T1, triode T2, resistance is for limiting triode base
The electric current of pole, resistance R8 resistance value are 50 Ω, and triode T1, T2 form push-pull driver circuit, enhance the driving energy for metal-oxide-semiconductor
Power, when U3 exports high level, metal-oxide-semiconductor is connected in triode T1 saturation conduction, push-pull circuit output high level signal, when U3 is defeated
Out when low level, triode T2 saturation conduction, push-pull circuit exports low level signal, MOS shutdown.
As shown in fig. 6, being the way circuit figure of one embodiment of the invention, the course of work of circuit is as follows:
When the direct current power source voltage of MOS switch pipe S1 connection is higher than the another way DC power supply of connection load end, at this time
MOS switch pipe S1 is off state, and DC power supply is powered by the body diode D1 of metal-oxide-semiconductor S1 to load end, and output electric current is just
To resistance R1 is flowed through, the both ends resistance R1 sampled voltage send to the non-inverting input terminal of comparator U1, compares when output current value reaches
Value IL1When, comparator U1 exports high level to the end S of rest-set flip-flop U3, and the output end output high level of U3 is to driving chip U4's
Input terminal, the output end of U4 export the grid of high level to MOS switch pipe S1, driving metal-oxide-semiconductor S1 conducting, and DC power supply passes through
Metal-oxide-semiconductor S1 output is that load end is powered；When the direct current power source voltage of metal-oxide-semiconductor S1 connection is lower than other road direct currents for connecting load end
When power supply, if MOS switch pipe S1 is in opening state at this time, electric current can flow counterflow through metal-oxide-semiconductor S1 by resistance R1, at this time resistance
The both ends sampled voltage of R1 send the reversed ratio circuit constituted to amplifier U5, resistance R6, resistance R7, and amplifier U5 exports reverse process
Sampled signal to comparator U2 non-inverting input terminal, when reverse current reaches fiducial value IL2When, comparator U2 exports high level
To the end R of rest-set flip-flop U3, the output end of U3 exports the input terminal of low level to driving chip U4, and the output end of U4 exports low electricity
It puts down to the grid of metal-oxide-semiconductor S1, drives metal-oxide-semiconductor S1 shutdown, block reverse current.
In conclusion active redundant parallel power-supplying circuit disclosed in the present embodiment, novel form, structure is simple,
It is at low cost, the loss of parallel redundancy circuit is reduced, can satisfy the use demand of most of DC power supply parallel redundancy, Ke Yiyun
It uses in all kinds of power-supply devices.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of active redundant parallel power-supplying circuit, which is characterized in that including switch block, reversal detection components
With switch control component；
The switch block is connected to the output of single channel DC power supply just between reversal detection components, is examined by reversal
It surveys component and connects load end；For being switched on or switched off single channel DC power supply to the power supply of load end；
The reversal detection components, for detecting the size and flow direction that flow through reversal detection components electric current, and will inspection
It surveys result and is output to switch control component；
The control terminal of the switch control component connection switch component, the testing result control exported according to reversal detection components
It makes the switch block and is switched on or switched off single channel DC power supply.
2. power-supplying circuit according to claim 1, which is characterized in that the switch block includes MOS switch pipe S1
With body diode D1；
The drain electrode of the MOS switch pipe S1 is just being connect with DC power supply output, and source electrode is negative by the connection of reversal detection components
End is carried, grid is connect with the output end of switch control component；
The anode of the body diode D1 is just being connect with DC power supply output, and cathode passes through the connection load of reversal detection components
End.
3. power-supplying circuit according to claim 1, which is characterized in that the reversal detection components include detection
Resistance R1, detection output and reference ground；
One end of the resistance R1 is connect with switch block, and the other end is connect with load end；Detection output from resistance R1 with open
Component connecting pin is closed to draw；It is drawn with reference to ground from the connecting pin of resistance R1 and load end.
4. power-supplying circuit according to claim 3, which is characterized in that the detection resistance R1 is m Ω grades of resistance.
5. power-supplying circuit according to claim 3, which is characterized in that described to be isolated with reference to ground with power ground.
6. power-supplying circuit according to claim 3, which is characterized in that the switch control component, including positive current
Decision circuitry, negative current decision circuitry, ON-OFF control circuit and switch driving circuit；
The input terminal of the positive current decision circuitry connects reversal detection components output end, the positive current decision circuitry
The switch connection control terminal of output end connection switch control circuit；
The input terminal of the negative current decision circuitry connects reversal detection components output end, the negative current decision circuitry
The switch of output end connection switch control circuit disconnects control terminal；
The output end of the ON-OFF control circuit passes through switch driving circuit connection switch component control terminal；
When reversal detection components output positive current detected value is greater than the positive current threshold value of setting, positive current decision circuitry is defeated
Control signal arrives the switch connection control terminal of ON-OFF control circuit out, and ON-OFF control circuit output, which is connected, switchs component signals to opening
After pass driving circuit amplifies, control switch component is connected；
When reversal detection components output negative current detected value is greater than the negative current threshold value of setting, negative current decision circuitry is defeated
The switch of control signal to ON-OFF control circuit disconnects control terminal out, and ON-OFF control circuit output disconnection switch block signal is to opening
After pass driving circuit amplifies, control switch component is disconnected.
7. power-supplying circuit according to claim 6, which is characterized in that the positive current decision circuitry, including amplifier
U1, resistance R2, R3；Described resistance R2, R3 are connected on reference voltage Vr and with reference between ground, and the connecting pin of resistance R2, R3 connect
The inverting input terminal of the amplifier U1；Reversal detection components output end connects the non-inverting input terminal of the amplifier U1, described
The switch connection control terminal of the output end connection switch control circuit of amplifier.
8. power-supplying circuit according to claim 6, which is characterized in that the negative current decision circuitry, including amplifier
U2, amplifier U5, resistance R4, R5, R6 and R7；The non-inverting input terminal of the amplifier U5 passes through resistance R6 and reversal detection components
Output end connection, the inverting input terminal of the amplifier U5 are connect with reference to ground, the output end of the amplifier U5 pass through resistance R7 and
The non-inverting input terminal of the amplifier U5 connects；Described resistance R4, R5 are connected between reference voltage Vr and reference ground, resistance R4,
The connecting pin of R5 connects the inverting input terminal of the amplifier U2, and the non-inverting input terminal of the amplifier U2 and the output end of amplifier U5 connect
It connects；The switch of the output end connection switch control circuit of the amplifier U2 disconnects control terminal.
9. power-supplying circuit according to claim 7 or 8, which is characterized in that the positive current threshold valueIn the case where R1 resistance value determines, positive current threshold value is adjusted by adjusting the resistance value of R2, R3；Or
Person adjusts positive current threshold value in the case where the resistance value of R2, R3 determine by adjusting the resistance value of R1；
Shown negative current threshold valueIn the case where R1 resistance value determines, by adjusting the resistance value of R4, R5
Adjust negative current threshold value；Alternatively, adjusting negative current threshold value in the case where the resistance value of R4, R5 determine by adjusting the resistance value of R1.
10. power-supplying circuit according to claim 5, which is characterized in that the ON-OFF control circuit includes RS triggering
Device U3, the end S of the rest-set flip-flop connect the output end of the positive current decision circuitry；The end R of the rest-set flip-flop connects institute
State the output end of negative current decision circuitry；The end Q of the rest-set flip-flop connects the input terminal of the switch driving circuit.
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| CN111725796A (en) * | 2019-03-20 | 2020-09-29 | 横河电机株式会社 | Power supply system and power supply device |
| CN112217181A (en) * | 2019-07-10 | 2021-01-12 | 神讯电脑(昆山)有限公司 | Power supply protection method and circuit for electronic device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112217181A (en) * | 2019-07-10 | 2021-01-12 | 神讯电脑(昆山)有限公司 | Power supply protection method and circuit for electronic device |
| CN112217181B (en) * | 2019-07-10 | 2023-07-11 | 神讯电脑(昆山)有限公司 | Power protection method and circuit for electronic device |
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