CN209659145U - A kind of electrical integrated protection circuit of charge and discharge for bidirectional DC power supply - Google Patents
A kind of electrical integrated protection circuit of charge and discharge for bidirectional DC power supply Download PDFInfo
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- CN209659145U CN209659145U CN201920345842.9U CN201920345842U CN209659145U CN 209659145 U CN209659145 U CN 209659145U CN 201920345842 U CN201920345842 U CN 201920345842U CN 209659145 U CN209659145 U CN 209659145U
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Abstract
The utility model discloses a kind of electrical integrated protection circuits of charge and discharge for bidirectional DC power supply.Including the first DC power supply incoming end and the second DC power supply incoming end; first DC power supply incoming end is successively electrically connected with the first charge-discharge protection circuit, first capacitor, power inverter; in the other side of power inverter, the second capacitor, the second charge-discharge protection circuit, the second DC power supply incoming end are sequentially connected electrically；When bidirectional DC power supply forward direction is powered on work, the first charge-discharge protection circuit carries out preliminary filling electric protection to first capacitor, and when loading disconnection, the second charge-discharge protection circuit release to the second capacitor and can be protected；With aforementioned similar working method when work is powered up reversely in the bidirectional DC power supply.This circuit realizes the duplicate protection that energy is pre-charged and released in bidirectional DC power supply, simplifies circuit design, reduces cost, high reliablity, and is applicable to high and low pressure occasion.
Description
Technical field
The utility model relates to automobile charging pile field more particularly to a kind of charge and discharge one for bidirectional DC power supply
Change protection circuit.
Background technique
In DC power supply, have a burning voltage for proof load, usually load both ends setting capacitance usually all compared with
Big capacitor, however capacitor's capacity is bigger, it is bigger in energization moment impact electric current, fuse, or even damage can be burnt when serious
Bad capacitor.In addition, the capacitive energy is unable to quick release and falls after power cut-off again, this will bring the person and equipment safety
Harm.It can be seen that power circuit needs to carry out effective protection to capacitor during powered up and down, damage otherwise can be brought
Power supply and the security risk for injuring the person.
In the prior art, the peace for powering on and powering off is solved with energy circuit is released by setting current-limiting circuit respectively in power supply
Full property problem, but current-limiting circuit is usually two independent circuits with energy circuit is released, internal electronic component is more and complicated, so that
Power volume is big, and manufacturing cost is high, is unfavorable for market competition.
Utility model content
The utility model is mainly solving the technical problems that provide a kind of charge and discharge for bidirectional DC power supply electrical integrated
Circuit is protected, solves the problems, such as the safety of bidirectional DC power supply in the prior art and intensive.
In order to solve the above technical problems, the technical solution that the utility model uses is to provide one kind for bidirectional, dc
The electrical integrated protection circuit of the charge and discharge of power supply, including the first DC power supply incoming end and the second DC power supply incoming end, described
One DC power supply incoming end is electrically connected with the input terminal of the first charge-discharge protection circuit, the output end of the first charge-discharge protection circuit
It is electrically connected first capacitor, the first two directions' inputing output end of the first capacitor electrical connection power inverter, the power conversion
Second two directions' inputing output end of device is electrically connected with the second capacitor, and second capacitor is also defeated with the second charge-discharge protection circuit
The input terminal of outlet electrical connection, the second charge-discharge protection circuit is electrically connected the second DC power supply incoming end；When described two-way
When DC power supply forward direction works, external dc power, the second DC power supply incoming end are accessed by the first DC power supply incoming end
The second load of access, after the power-up of the first DC power supply incoming end, first charge-discharge protection circuit is to the first capacitor
Precharge, after power inverter, then via the second capacitor and the second charge-discharge protection circuit to the second load supplying；When
After two DC power supply incoming ends and the second load disconnect, power inverter stops working, and the second charge-discharge protection circuit is to second
Capacitor releases energy；When the bidirectional DC power supply reverse operation, external dc power is accessed by the second DC power supply incoming end,
The first load of first DC power supply incoming end access, after the power-up of the second DC power supply incoming end, second charge and discharge protecting
Circuit is pre-charged to second capacitor, after power inverter, then via first capacitor and the first charge-discharge protection circuit
To the first load supplying；After the first DC power supply incoming end and the first load disconnect, power inverter stops working, and described the
One charge-discharge protection circuit releases energy to the first capacitor.
In charge and discharge electrical integrated protection circuit another embodiment of the utility model for bidirectional DC power supply, described the
One charge-discharge protection circuit includes first switch, third switch, first resistor and the first protective module, and the one of the third switch
Hold the input terminal as first charge-discharge protection circuit, the other end and the one of the first switch of the third switch
End, one end of the first resistor and first protective module input terminal be electrically connected, the first switch and described the
The other end of one resistor coupled in parallel, the other end of the first switch and the first resistor is electrically connected and as first charge and discharge
The output end of electric protection circuit is electrically connected one end of the first capacitor, and the other end of the first capacitor is grounded, and described first
The output end of protective module is also grounded, and the first two directions' inputing that the both ends of the first capacitor are electrically connected the power inverter is defeated
Outlet.
In charge and discharge electrical integrated protection circuit another embodiment of the utility model for bidirectional DC power supply, described the
Two charge-discharge protection circuits include second switch, the 4th switch, second resistance and the second protective module, and the one of the 4th switch
Hold the input terminal as second charge-discharge protection circuit, the other end and the one of the second switch of the 4th switch
End, one end of the second resistance and second protective module input terminal be electrically connected, the second switch and described the
The other end of two resistor coupled in parallel, the other end of the second switch and the second resistance is electrically connected and as second charge and discharge
The output end of electric protection circuit is electrically connected one end of second capacitor, and the other end of second capacitor is grounded, and described second
The output end of protective module is also grounded, and the second two directions' inputing that the both ends of second capacitor are electrically connected the power inverter is defeated
Outlet.
In charge and discharge electrical integrated protection circuit another embodiment of the utility model for bidirectional DC power supply, when described
When bidirectional DC power supply forward direction works, the third closes the switch power-up, and the first switch is in an open state, from outside
The electric current of first DC power supply need to first pass through the first resistor and be pre-charged to the first capacitor, to the first capacitor both ends
Voltage is charged to identical as the voltage of the first DC power supply, is closed the first switch at this time, the electric energy of the first DC power supply is through institute
Third switch, first switch to the power inverter are stated, after the power converters, the load of Xiang Suoshu second is supplied
Electricity；When second load power down stops working, the second switch, the 4th switch are disconnected, second protective module
Input terminal and the controlled connection of output end, the electric energy of second capacitor is through the second resistance and the second protective module structure
At circuit discharged.
In charge and discharge electrical integrated protection circuit another embodiment of the utility model for bidirectional DC power supply, when described
When bidirectional DC power supply reverse operation, the described 4th closes the switch power-up, and the second switch is in an open state, from outside
The electric current of second DC power supply need to first pass through the second resistance and be pre-charged to second capacitor, to second capacitor both ends
Voltage is charged to identical as the voltage of the second DC power supply, is closed the second switch at this time, the electric energy of the second DC power supply is through institute
The 4th switch, second switch to the power inverter are stated, after the power converters, the load of Xiang Suoshu first is supplied
Electricity；When first load power down stops working, the first switch, third switch are disconnected, first protective module
Input terminal and the controlled connection of output end, the electric energy of the first capacitor is through the first resistor and the first protective module structure
At circuit discharged.
In charge and discharge electrical integrated protection circuit another embodiment of the utility model for bidirectional DC power supply, described the
The input terminal of two protective modules is electrically connected the 8th resistance, the positive terminal and voltage-stabiliser tube of the other end electrical connection diode of the 8th resistance
Negative pole end, the voltage-stabiliser tube positive terminal ground connection, the diode negative pole end connection polar capacitor positive terminal, the pole
Property capacitor negative pole end ground connection；Second protective module further includes optocoupler, first switch tube and second switch, is opened first
The first pull down resistor and the first filter capacitor are parallel between the base stage and emitter of pass pipe and the first current-limiting resistance also connects
To the base stage of first switch tube, the collector of first switch tube is electrically connected with the negative input of the optocoupler, the optocoupler
Electrode input end is connect by the second current-limiting resistance electrical connection control power supply, the pole the C output end of optocoupler by being electrically connected in series capacitor
The pole the C output end on ground, optocoupler is also electrically connected with the positive terminal of polar capacitor, the pole the E output end electrical connection third current limliting electricity of optocoupler
The other end of one end of resistance, third current-limiting resistance is electrically connected the second filter capacitor, the second pull down resistor and second switch
Grid, the second filter capacitor, the second pull down resistor are parallel between the grid of second switch and source electrode, and the second filtered electrical
Hold, the source grounding of the other end of the second pull down resistor and second switch, the drain electrode of second switch is also electrically connected second
The input terminal of protective module.
It is described double in charge and discharge electrical integrated protection circuit another embodiment of the utility model for bidirectional DC power supply
When working to DC power supply forward direction, when electric energy is after power inverter is output to second protective module, electric energy is by the
The input terminal of two protective modules, by the 8th resistance, diode to polar capacitor charge, when the voltage of polar capacitor be charged to surely
After the pressure stabilizing value of pressure pipe is identical, polar capacitor stops charging；After the second load end disconnects, the power inverter stops work
Make, second switch, the 4th switch are off-state at this time, and polar capacitor is filled in the input terminal stopping of second protective module
Electricity releases and controls signal output high level signal, through the first current-limiting resistance, the first filter capacitor, the first pull down resistor to first
The base stage of switching tube is begun to turn on after first switch tube reaches threshold value, and control power supply is through the second current-limiting resistance and optocoupler
Electrode input end and negative input, there are also first switch tube forming circuit, optocoupler is begun to turn on, meanwhile, two of optocoupler are defeated
Outlet, the positive terminal of polar capacitor and second switch are also switched on, two outputs of the energy of a charge in polar capacitor through optocoupler
End, second switch, driving third current-limiting resistance, the second filter capacitor, the second pull down resistor are applied to the grid of second switch
Pole, after second switch reaches conducting threshold value, second switch is begun to turn on, thus the second capacitor, the second electric group, second
Switching tube forms discharge loop, and the utilization of power being stored in the second capacitor is discharged by second resistance, works as polar capacitor
Lower than after the minimum conducting threshold value of second switch or optocoupler, second switch or optocoupler disconnect the electric energy of middle storage.
The beneficial effects of the utility model are: the utility model discloses a kind of charge and discharge one for bidirectional DC power supply
Bodyization protects circuit.Including the first DC power supply incoming end and the second DC power supply incoming end, the first DC power supply incoming end according to
It is secondary to be electrically connected with the first charge-discharge protection circuit, first capacitor, power inverter, in the other side of power inverter, the second electricity
Appearance, the second charge-discharge protection circuit, the second DC power supply incoming end are sequentially connected electrically；When bidirectional DC power supply forward direction is powered on work
When, the first charge-discharge protection circuit carries out preliminary filling electric protection to first capacitor, when loading disconnection, the second charge-discharge protection circuit
Release to the second capacitor can protect；With aforementioned similar working method when work is powered up reversely in the bidirectional DC power supply.This
Circuit realizes the duplicate protection that energy is pre-charged and released in bidirectional DC power supply, simplifies circuit design, reduces cost, can
By property height, and it is applicable to high and low pressure occasion.
Detailed description of the invention
Fig. 1 is the group according to the utility model for electrical integrated protection one embodiment of circuit of charge and discharge of bidirectional DC power supply
At block diagram；
Fig. 2 is another embodiment of the electrical integrated protection circuit of charge and discharge that bidirectional DC power supply is used for according to the utility model
Composition figure；
Fig. 3 is another embodiment of the electrical integrated protection circuit of charge and discharge that bidirectional DC power supply is used for according to the utility model
The circuit diagram of second protective module.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different
Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this
The understanding of the disclosure of utility model is more thorough and comprehensive.
It should be noted that unless otherwise defined, all technical and scientific terms used in this specification with belong to
The normally understood meaning of those skilled in the art of the utility model is identical.In the used in the description of the utility model
Term be only for the purpose of describing specific embodiments be not intended to limitation the utility model.Used in this specification
Term "and/or" includes any and all combinations of one or more related listed items.
Fig. 1 shows group of the utility model for electrical integrated protection one embodiment of circuit of charge and discharge of bidirectional DC power supply
At block diagram.In Fig. 1, including the first DC power supply incoming end PWR1 and the second DC power supply incoming end PWR2, described first is straight
Stream power access end PWR1 is electrically connected with the input terminal of the first charge-discharge protection circuit CFD1, the first charge-discharge protection circuit CFD1
Output end be electrically connected first capacitor C1, the first two directions' inputing output of first capacitor C1 electrical connection power inverter PX1
PX11, the second two directions' inputing output end PX12 of the power inverter PX1 is held to be electrically connected with the second capacitor C2, second electricity
Hold C2 to be also electrically connected with the output end of the second charge-discharge protection circuit CFD1, the input terminal electricity of the second charge-discharge protection circuit CFD2
Connect the second DC power supply incoming end PWR2.
As shown in Figure 1, being accessed when bidirectional DC power supply forward direction work by the first DC power supply incoming end PWR1
External dc power, the second DC power supply incoming end PWR2 access load, after the first DC power supply incoming end PWR1 power-up, institute
It states the first charge-discharge protection circuit CFD1 to be pre-charged to the first capacitor C1, after power inverter PX1, then via
Two capacitor C2 and the second charge-discharge protection circuit CFD2 power to the load；When the second DC power supply incoming end PWR2 and load are disconnected
Afterwards, power inverter PX1 stops working, and the second charge-discharge protection circuit CFD2 releases energy to the second capacitor C2.When described two-way straight
When the reverse operation of galvanic electricity source, external dc power, the access of the first DC power supply are accessed by the second DC power supply incoming end PWR2
PWR1 access load is held, after the second DC power supply incoming end PWR2 power-up, the second charge-discharge protection circuit CFD2 is to institute
The second capacitor C2 precharge is stated, after power inverter PX1, then via first capacitor C1 and the first charge-discharge protection circuit
CFD1 powers to the load；After the first DC power supply incoming end PWR1 and load disconnect, power inverter PX1 stops working, the
One charge-discharge protection circuit CFD1 releases energy to first capacitor C1.
It can thus be seen that in the bidirectional DC power supply, when working for forward direction, first charge-discharge protection circuit
CFD1 can be pre-charged to the first capacitor C1, i.e., between the first DC power supply incoming end PWR1 and the first capacitor C1
The circuit for increasing current limiting effect, is exactly first charge-discharge protection circuit CFD1, it is possible thereby to slowly fill to first capacitor C1
Electricity, it is possible thereby to avoid external power supply from being directly powered on to first capacitor C1, because if external power supply is applied directly to the first electricity
The both ends for holding C1, can generate transient high-current, be equivalent to two terminal shortcircuits of first capacitor C1, cause the damage to power supply.For
When opposite direction works, the first charge-discharge protection circuit CFD1 releases energy, i.e. first capacitor C1 and the first charge and discharge to first capacitor C1
Circuit CFD1 forming circuit is protected, the electric energy of first capacitor C1 storage can be delayed by the first charge-discharge protection circuit CFD1
On The Drug Release can cannot discharge and bring potential danger in this way to avoid the electric energy of first capacitor C1.Second charge and discharge are protected
Protection circuit CFD2 also has similar functional effect to the second capacitor C2, and which is not described herein again.
Further, the first charge-discharge protection circuit and the second charge-discharge protection circuit circuit composition knot having the same
Structure.
As shown in Fig. 2, first charge-discharge protection circuit includes first switch K1, third switch K3, first resistor R1
With the first protective module BH1, input terminal of the one end of third switch K3 as first charge-discharge protection circuit, third switch K3
The other end and the input terminal of one end of first switch K1, one end of first resistor R1 and the first protective module BH1 be electrically connected
It connects, first switch K1 and first resistor R1 are in parallel, and the other end electrical connection of the other end and first resistor R1 of first switch K1 is simultaneously
One end of output end electrical connection first capacitor C1 as first charge-discharge protection circuit, another termination of first capacitor C1
The output end on ground, the first protective module BH1 is also grounded, and the both ends the first capacitor C1 are electrically connected first pair of power inverter
To input/output terminal.With it is aforementioned similar, second charge-discharge protection circuit includes second switch K2, the 4th switch K4, second
Resistance R2 and the second protective module BH2, input terminal of the one end of the 4th switch K4 as second charge-discharge protection circuit, the
The other end of four switch K4 and the input terminal of one end of second switch K2, one end of second resistance R2 and the second protective module are electric
Connection, second switch K2 and second resistance R2 are in parallel, the other end electrical connection of the other end and second resistance R2 of second switch K2
And one end of the second capacitor C2, another termination of the second capacitor C2 are electrically connected as the output end of second charge-discharge protection circuit
The output end on ground, the second protective module is also grounded, the second two directions' inputing output end and the second capacitor C2 of the power inverter
Both ends electrical connection.
Based on embodiment illustrated in fig. 1, further as shown in Fig. 2, when bidirectional DC power supply forward direction work, described the
Three switch K3 closure power-up, since first capacitor C1 capacitance is larger, the moment first capacitor C1 both end voltage that is powered is zero to be equivalent to
Short circuit, immediate current can be very big, this is that capacitance characteristic determines, immediate current is excessive and damages device to prevent, the when powering on
One capacitor C1 cannot be directly connected to the first external DC power supply Vi, and the first switch K1 is in an open state at this time, from outer
The electric current of the first DC power supply Vi in portion need to first pass through the first resistor R1 and be pre-charged to the first capacitor C1, utilize first
The cut-off current characteristics of resistance R1 slowly charge to first capacitor C1, are charged to and the first direct current to the first capacitor C1 both end voltage
The voltage of source Vi is identical, is closed the first switch K1 at this time, after first switch K1 closure, the electric energy of the first DC power supply Vi
Through third switch K3, first switch K1 to power inverter PX1, first resistor R1 stops working, the electricity of the first DC power supply Vi
Can through the third switch K3, first switch K1 to the power inverter PX1, after power inverter PX1 transformation, to
Second load supplying, when power inverter is started to work, second switch K2, the 4th switch K4 are closed, external power supply Vi's
Electric energy is transmitted to load end through power inverter, the second capacitor C2, second switch K2, the 4th switch K4, at this time second switch K2
For closed state, so second resistance R2 does not work.When second load power down stops working, the second switch K2,
4th switch K4 is disconnected, the input terminal of the second protective module BH2 and the controlled connection of output end, the second capacitor C2
The circuit that is constituted through the second resistance R2 and the second protective module BH2 of electric energy discharged.
When the bidirectional DC power supply reverse operation, the 4th switch K4 closure is powered on, and the second switch K2 is
Opening state, the electric current from the second external DC power supply VO need to first pass through the second resistance R2 to the second capacitor C2
Precharge, is charged to identical as the voltage of the second DC power supply VO to the second capacitor C2 both end voltage, is closed described the at this time
The electric energy of two switch K2, the second DC power supply VO through the 4th switch K4, second switch K2 to the power inverter PX1,
After power inverter PX1 transformation, the first load supplying of Xiang Suoshu；When first load power down stops working, institute
State first switch K1, third switch K3 is disconnected, the input terminal of the first protective module BH1 and the controlled connection of output end, institute
The electric energy for stating first capacitor C1 is discharged through the circuit of the first resistor R1 and the first protective module BH1 composition.It should
Process is similar with the bidirectional DC power supply forward direction work, does not repeat further.
Further, it is illustrated in figure 3 the inside composition of the first protective module, the inside composition of the second protective module is therewith
It is identical.
Illustrate by taking the second protective module as an example, the input terminal B of second protective module is electrically connected the 8th resistance R8, the 8th electricity
The positive terminal of the other end electrical connection diode D1 of R8 and the negative pole end of voltage-stabiliser tube D2 are hindered, the positive terminal of voltage-stabiliser tube D2 is grounded, and two
The positive terminal of the negative pole end connection polar capacitor C6 of pole pipe D1, the negative pole end ground connection of polar capacitor C6；In addition, the second protection mould
Block further includes optocoupler U1, first switch tube Q1 and second switch Q2, and wherein first switch tube Q1 is preferably three poles of NPN type
Pipe, is parallel with the first pull down resistor R4 and the first filter capacitor C3 between the base stage and emitter of first switch tube Q1, and
First current-limiting resistance R3 is also connected to the base stage of first switch tube Q1, and the collector and optocoupler U1 cathode of first switch tube Q1 is defeated
Enter end electrical connection, optocoupler U1 electrode input end connects control power supply by the second current-limiting resistance R5, and the pole the C output end of optocoupler U1 passes through
It is grounded after being electrically connected in series capacitor C4, the pole the C output end of optocoupler U1 is also electrically connected with the positive terminal of polar capacitor C6, optocoupler U1
The pole E output end electrical connection third current-limiting resistance R6 one end, the other end of third current-limiting resistance R6 is electrically connected the second filtered electrical
Hold the grid of C5, the second pull down resistor R7 and second switch Q2, the second filter capacitor C5 and the second pull down resistor R7 are in parallel
To between the grid and source electrode of second switch Q2, and the other end of the second filter capacitor C5, the second pull down resistor R7 and
The source grounding of two switching tube Q2, the drain electrode of second switch Q2 are also electrically connected the input terminal of the second protective module.
In bidirectional DC power supply forward direction work, when electric energy is after power inverter is output to the second protective module,
When input terminal B point in electric energy transmittance process Jing Guo the second protective module, electric energy will be given by the 8th resistance R8, diode D1
Polar capacitor C6 charging, after polar capacitor C6 voltage is charged to identical as voltage-stabiliser tube D2 pressure stabilizing value, polar capacitor C6 stops charging.
Charging rate can be changed by adjusting the resistance value of the 8th resistance R8, the capacitance of polar capacitor C6.If polar capacitor C6
Capacitance fix, the resistance value of the 8th resistance R8 is bigger, and charging rate is slower, otherwise faster.If the resistance value of the 8th resistance R8 is solid
Fixed, the capacitance of polar capacitor C6 is bigger, charges slower, otherwise faster.
When the second load end disconnects, power inverter stops working, and second switch K2, the 4th switch K4 are to disconnect shape at this time
State, the input terminal B of the second protective module stops charging to polar capacitor C6, because of the presence of diode D1, the electricity of polar capacitor C6
Lotus energy is discharged without circuit, can only continue to be stored in polar capacitor C6.Equally, the energy of a charge in the second capacitor C2 also without return
Road release, can only continue to be stored in the second capacitor C2, because the second capacitor C2 is bus capacitor, capacitance is than polar capacitor C6
Capacitance it is much bigger, if the energy of a charge in the second capacitor C2 is not discharged, this can all bring equipment and personal safety
Harm.
Preferably, the course of work of the second protective module are as follows: release and control signal output high level signal, through the first current limliting
Resistance R3, the first filter capacitor C3, the first pull down resistor R4 to first switch tube Q1, after first switch tube Q1 reaches threshold value
It begins to turn on, controls electrode input end and negative input of the power supply VCC_1 through the second current-limiting resistance R5 Yu optocoupler U1, also
First switch tube Q1 forming circuit, optocoupler U1 are begun to turn on.After optocoupler U1 conducting, two output ends, the polarity electricity of optocoupler U1
The positive terminal (VCC_2 in corresponding diagram 3) for holding C6 is connected with second switch Q2, this is by being stored in polar capacitor C6
Energy of a charge supply, without individually powering up.Two output ends through optocoupler U1 of energy of a charge in polar capacitor C6, second open
The grid of pipe Q2 driving third current-limiting resistance R6, the second filter capacitor C5, the second pull down resistor R7 supply second switch Q2 are closed,
After second switch Q2 reaches conducting threshold value, second switch Q2 is begun to turn on.After second switch Q2 conducting, the second electricity
Discharge loop will be formed by holding C2, the second electricity group R2, second switch Q2, the energy utilization second being stored in the second capacitor C2
Resistance R2 is discharged.When lower than second switch Q2 or optocoupler U1, one of them minimum leads the energy stored in polar capacitor C6
After open gate threshold value, second switch Q2 or optocoupler U1 are disconnected.Second capacitor C2 discharge time depended on second resistance R2 resistance value,
The capacitance of polar capacitor C6 controls the high level lasting time of signal output with releasing.Second resistance R2 resistance value is bigger, electric discharge
Time is slower, otherwise faster.The capacitance of polar capacitor C6 is bigger, and storage energy is more, mentions to optocoupler U1 and second switch Q2
Longer for turn-on time, the smaller turn-on time of phase stiffness is shorter, this limits in having time and interferes biggish occasion, Ke Yiyou
Effect prevents high level overtime, and the high level lasting time of optocoupler U1 control terminal side is customized by the user setting.
It can be seen that the utility model discloses a kind of electrical integrated protection circuits of charge and discharge for bidirectional DC power supply.
Including the first DC power supply incoming end and the second DC power supply incoming end, the first DC power supply incoming end successively with the first charge and discharge
Circuit, first capacitor, power inverter electrical connection are protected, in the other side of power inverter, the second capacitor, the second charge and discharge are protected
Protection circuit, the second DC power supply incoming end are sequentially connected electrically；When bidirectional DC power supply forward direction is powered on work, the first charge and discharge are protected
Protection circuit carries out preliminary filling electric protection to first capacitor, and when loading disconnection, the second charge-discharge protection circuit carries out the second capacitor
Releasing can protect；With aforementioned similar working method when work is powered up reversely in the bidirectional DC power supply.This circuit is realized double
The duplicate protection of energy is pre-charged and released into DC power supply, is simplified circuit design, is reduced cost, high reliablity, and can fit
For high and low pressure occasion.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure transformation made based on the specification and figures of the utility model, it is relevant to be applied directly or indirectly in other
Technical field is also included in the patent protection scope of the utility model.
Claims (7)
1. a kind of electrical integrated protection circuit of charge and discharge for bidirectional DC power supply, which is characterized in that including the first DC power supply
Incoming end and the second DC power supply incoming end, the input terminal of the first DC power supply incoming end and the first charge-discharge protection circuit
Electrical connection, the output end of the first charge-discharge protection circuit are electrically connected first capacitor, and the first capacitor is electrically connected power inverter
The first two directions' inputing output end, the second two directions' inputing output end of the power inverter is electrically connected with the second capacitor, described
Second capacitor is also electrically connected with the output end of the second charge-discharge protection circuit, the input terminal electrical connection of the second charge-discharge protection circuit
The second DC power supply incoming end；
When the bidirectional DC power supply forward direction work when, by the first DC power supply incoming end access external dc power, second
The second load of DC power supply incoming end access, after the power-up of the first DC power supply incoming end, first charge-discharge protection circuit
It is pre-charged to the first capacitor, after power inverter, then via the second capacitor and the second charge-discharge protection circuit to the
Two load supplyings；After the second DC power supply incoming end and the second load disconnect, power inverter stops working, the second charge and discharge
Circuit is protected to release energy to the second capacitor；
When the bidirectional DC power supply reverse operation, by the second DC power supply incoming end access external dc power, first
The first load of DC power supply incoming end access, after the power-up of the second DC power supply incoming end, second charge-discharge protection circuit
It is pre-charged to second capacitor, after power inverter, then via first capacitor and the first charge-discharge protection circuit to the
One load supplying；After the first DC power supply incoming end and the first load disconnect, power inverter stops working, and described first fills
Discharge protection circuit releases energy to the first capacitor.
2. the electrical integrated protection circuit of the charge and discharge according to claim 1 for bidirectional DC power supply, which is characterized in that institute
Stating the first charge-discharge protection circuit includes first switch, third switch, first resistor and the first protective module, the third switch
Input terminal of the one end as first charge-discharge protection circuit, the other end of the third switch and the first switch
The input terminal of one end, one end of the first resistor and first protective module is electrically connected, the first switch and described
First resistor is in parallel, and the other end of the other end of the first switch and the first resistor is electrically connected and fills as described first
The output end of discharge protection circuit is electrically connected one end of the first capacitor, the other end ground connection of the first capacitor, and described the
The output end of one protective module is also grounded, and the both ends of the first capacitor are electrically connected the first two directions' inputing of the power inverter
Output end.
3. the electrical integrated protection circuit of the charge and discharge according to claim 2 for bidirectional DC power supply, which is characterized in that institute
Stating the second charge-discharge protection circuit includes second switch, the 4th switch, second resistance and the second protective module, the 4th switch
Input terminal of the one end as second charge-discharge protection circuit, the other end of the 4th switch and the second switch
The input terminal of one end, one end of the second resistance and second protective module is electrically connected, the second switch and described
Second resistance is in parallel, and the other end of the other end of the second switch and the second resistance is electrically connected and fills as described second
The output end of discharge protection circuit is electrically connected one end of second capacitor, the other end ground connection of second capacitor, and described the
The output end of two protective modules is also grounded, and the both ends of second capacitor are electrically connected the second two directions' inputing of the power inverter
Output end.
4. the electrical integrated protection circuit of the charge and discharge according to claim 3 for bidirectional DC power supply, which is characterized in that when
When the bidirectional DC power supply forward direction works, the third closes the switch power-up, and the first switch is in an open state, from outer
The electric current of first DC power supply in portion need to first pass through the first resistor and be pre-charged to the first capacitor, to the first capacitor
Both end voltage is charged to identical as the voltage of the first DC power supply, is closed the first switch, the electric energy of the first DC power supply at this time
Through third switch, first switch to the power inverter, after the power converters, Xiang Suoshu second is loaded
Power supply；
When second load power down stops working, the second switch, the 4th switch are disconnected, second protective module
Input terminal and the controlled connection of output end, the electric energy of second capacitor is through the second resistance and the second protective module structure
At circuit discharged.
5. the electrical integrated protection circuit of the charge and discharge according to claim 3 for bidirectional DC power supply, which is characterized in that when
When the bidirectional DC power supply reverse operation, the described 4th closes the switch power-up, and the second switch is in an open state, from outer
The electric current of second DC power supply in portion need to first pass through the second resistance and be pre-charged to second capacitor, to second capacitor
Both end voltage is charged to identical as the voltage of the second DC power supply, is closed the second switch, the electric energy of the second DC power supply at this time
Through the 4th switch, second switch to the power inverter, after the power converters, Xiang Suoshu first is loaded
Power supply；
When first load power down stops working, the first switch, third switch are disconnected, first protective module
Input terminal and the controlled connection of output end, the electric energy of the first capacitor is through the first resistor and the first protective module structure
At circuit discharged.
6. the electrical integrated protection circuit of the charge and discharge according to claim 5 for bidirectional DC power supply, which is characterized in that institute
The input terminal for stating the second protective module is electrically connected the 8th resistance, the positive terminal of the other end electrical connection diode of the 8th resistance and steady
The negative pole end of pressure pipe, the positive terminal ground connection of the voltage-stabiliser tube, the positive terminal of the negative pole end connection polar capacitor of the diode, institute
State the negative pole end ground connection of polar capacitor；Second protective module further includes optocoupler, first switch tube and second switch,
The first pull down resistor and the first filter capacitor and the first current-limiting resistance are parallel between the base stage and emitter of one switching tube
It is connected to the base stage of first switch tube, the collector of first switch tube is electrically connected with the negative input of the optocoupler, the light
The electrode input end of coupling is by the second current-limiting resistance electrical connection control power supply, and the pole the C output end of optocoupler is by being electrically connected in series electricity
Hold ground connection, the pole the C output end of optocoupler is also electrically connected with the positive terminal of polar capacitor, the pole the E output end electrical connection third limit of optocoupler
The other end of one end of leakage resistance, third current-limiting resistance is electrically connected the second filter capacitor, the second pull down resistor and second switch
The grid of pipe, the second filter capacitor, the second pull down resistor are parallel between the grid of second switch and source electrode, and the second filter
The drain electrode of the source grounding of wave capacitor, the other end of the second pull down resistor and second switch, second switch is also electrically connected
The input terminal of second protective module.
7. the electrical integrated protection circuit of the charge and discharge according to claim 6 for bidirectional DC power supply, which is characterized in that institute
When stating the work of bidirectional DC power supply forward direction, when electric energy is after power inverter is output to second protective module, electric energy is passed through
The input terminal for crossing the second protective module is charged by the 8th resistance, diode to polar capacitor, when the voltage of polar capacitor is charged to
After identical as the pressure stabilizing value of voltage-stabiliser tube, polar capacitor stops charging；
After the second load end disconnects, the power inverter stops working, and second switch, the 4th switch are disconnection shape at this time
State, the input terminal of second protective module stop charging to polar capacitor, release and control signal output high level signal, through the
The base stage of one current-limiting resistance, the first filter capacitor, the first pull down resistor to first switch tube, when first switch tube reaches threshold value
After begin to turn on, control electrode input end and negative input of the power supply through the second current-limiting resistance and optocoupler, there are also first switches
Pipe forming circuit, optocoupler begins to turn on, meanwhile, the positive terminal and second switch of two output ends of optocoupler, polar capacitor
It is connected, two output end, second switches of the energy of a charge through optocoupler in polar capacitor drive third current-limiting resistance, second
Filter capacitor, the second pull down resistor are applied to the grid of second switch, after second switch reaches conducting threshold value, second
Switching tube is begun to turn on, and thus the second capacitor, the second electric group, second switch form discharge loop, is stored in the second capacitor
Utilization of power discharged by second resistance, when the electric energy stored in polar capacitor most lower than second switch or optocoupler
After low conducting threshold value, second switch or optocoupler are disconnected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920345842.9U CN209659145U (en) | 2019-03-18 | 2019-03-18 | A kind of electrical integrated protection circuit of charge and discharge for bidirectional DC power supply |
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| CN201920345842.9U CN209659145U (en) | 2019-03-18 | 2019-03-18 | A kind of electrical integrated protection circuit of charge and discharge for bidirectional DC power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039179A (en) * | 2020-11-05 | 2020-12-04 | 武汉格罗夫氢能汽车有限公司 | Super capacitor bidirectional pre-charging system for fuel cell hydrogen energy automobile |
| CN113904308A (en) * | 2021-10-13 | 2022-01-07 | 山东大学 | Protection circuit for short circuit of piezoelectric sensor and sensing method |
| CN117175653A (en) * | 2023-08-04 | 2023-12-05 | 浙江晨泰科技股份有限公司 | Charging and discharging equipment and charging and discharging method based on high-power bidirectional charging and discharging module |
-
2019
- 2019-03-18 CN CN201920345842.9U patent/CN209659145U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039179A (en) * | 2020-11-05 | 2020-12-04 | 武汉格罗夫氢能汽车有限公司 | Super capacitor bidirectional pre-charging system for fuel cell hydrogen energy automobile |
| CN112039179B (en) * | 2020-11-05 | 2021-04-20 | 武汉格罗夫氢能汽车有限公司 | Super capacitor bidirectional pre-charging system for fuel cell hydrogen energy automobile |
| CN113904308A (en) * | 2021-10-13 | 2022-01-07 | 山东大学 | Protection circuit for short circuit of piezoelectric sensor and sensing method |
| CN113904308B (en) * | 2021-10-13 | 2022-06-14 | 山东大学 | Protection circuit for short circuit of piezoelectric sensor and sensing method |
| CN117175653A (en) * | 2023-08-04 | 2023-12-05 | 浙江晨泰科技股份有限公司 | Charging and discharging equipment and charging and discharging method based on high-power bidirectional charging and discharging module |
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